United States v. Michael L. Mitchell , 165 F. App'x 821 ( 2006 )


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    IN THE UNITED STATES COURT OF APPEALS
    FILED
    FOR THE ELEVENTH CIRCUIT
    U.S. COURT OF APPEALS
    _________________________ ELEVENTH CIRCUIT
    February 3, 2006
    No. 04-14450                      THOMAS K. KAHN
    _________________________                     CLERK
    D.C. Docket No. 03-00345-CR-TWT-1-1
    UNITED STATES OF AMERICA,
    Plaintiff-Appellant,
    versus
    MICHAEL L. MITCHELL,
    Defendant-Appellee.
    _________________________
    Appeal from the United States District Court for the
    Northern District of Georgia
    _________________________
    (February 3, 2006)
    Before ANDERSON, HULL and JOHN R. GIBSON*, Circuit Judges.
    JOHN R. GIBSON, Circuit Judge:
    *Honorable John R. Gibson, United States Circuit Judge for the Eighth Circuit, sitting by
    designation.
    The United States appeals the district court's post-trial acquittal of Michael
    L. Mitchell in this Medicare fraud case. The government contends that the district
    court erred in holding that it failed to marshal sufficient evidence to support the
    jury's verdict of guilty. We reverse the district court's entry of judgment of
    acquittal, but affirm its alternative order granting a new trial.
    Mitchell was charged with one count of conspiracy to defraud the United
    States and four counts of money laundering. The conspiracy count alleged that
    Mitchell conspired to commit three types of fraud: (1) health care fraud, 
    18 U.S.C. § 1347
     (2000), or the obtaining of Medicare funds by false and fraudulent
    pretenses and representations; (2) wire fraud, 
    18 U.S.C. § 1343
     (2000),1 or
    knowingly causing false and fraudulent billings for Medicare payments to be
    transmitted by wire in interstate commerce; and (3) knowing and willful making or
    use of a false writing or document in a matter within the jurisdiction of the
    executive, legislative or executive branch of the government of the United States,
    
    18 U.S.C. § 1001
    (a) (2000). The charges were tried to a jury, which was
    instructed that it only had to find Mitchell had conspired to commit one of the
    three fraud offenses, but that all jurors had to agree which of the offenses he
    1
    
    18 U.S.C. §§ 1001
     and 1343 were both amended after the date of the offenses alleged,
    and so we cite to the version in effect at the time of the offenses.
    2
    conspired to. The jury found Mitchell guilty on the conspiracy count, though the
    verdict form did not specify which of the substantive offenses the jury found
    Mitchell conspired to commit. The jury found Mitchell not guilty on the money
    laundering counts.
    Mitchell moved for judgment of acquittal and filed an alternative new trial
    motion. The district court granted the judgment of acquittal, and in the alternative,
    granted a new trial. The district court held that the government introduced no
    evidence that would allow the jury to find that the Medicare claims filed by
    Mitchell's company were false or made with fraudulent intent. The jury was "left
    to infer fraudulent intent from the alleged illegality of the clinic's billing
    practices," yet the government never introduced evidence of what the law required
    "in the form of Medicare regulations, operational manuals, administrative rulings
    or judicial decisions which showed that the clinic's billing practices were so
    clearly illegal that an inference of fraudulent intent can be drawn." United States
    v. Mitchell, No. 1:03-CR-345-1-TWT, slip op. at 2 (N.D. Ga. July 7, 2004). The
    only Medicare manual referred to at trial was never introduced into evidence. 
    Id.
    The district court held that although there was some evidence of falsification of
    records at the clinic, there was no evidence that Mitchell had any knowledge of or
    involvement in the falsification. 
    Id. at 2-3
    .
    3
    I.
    We review de novo a district court's grant of acquittal under Fed. R. Crim.
    P. 29(c). United States v. Ward, 
    197 F.3d 1076
    , 1079 (11th Cir. 1999). We must
    determine whether the evidence at trial was sufficient to permit a reasonable trier
    of fact to find the defendant guilty beyond a reasonable doubt, 
    id.,
     which is the
    same standard used to determine whether the evidence is sufficient to satisfy the
    demands of due process. See United States v. Allen, 
    302 F.3d 1260
    , 1262 (11th
    Cir. 2002) (citing Jackson v. Virginia, 
    443 U.S. 307
    , 319 (1979)). We must view
    the evidence in the light most favorable to the government, accepting the jury's
    reasonable inferences and credibility determinations. Glasser v. United States,
    
    315 U.S. 60
    , 80 (1942), superseded by rule on other grounds, Bourjaily v. United
    States, 
    483 U.S. 171
     (1987); Ward, 197 F.3d at 1079.
    To prove conspiracy, the government must show the existence of an
    agreement to achieve an unlawful objective, the defendant's knowing and
    voluntary participation in the conspiracy, and the commission of an overt act in
    furtherance of the conspiracy. United States v. Suba, 
    132 F.3d 662
    , 672 (11th Cir.
    1998). The elements of the three substantive offenses that were the subject of the
    conspiracy charge are similar to each other. Violation of 
    18 U.S.C. § 1001
    requires: (1) that the defendant made a statement (2) that was false (3) and
    4
    material, (4) that the defendant acted knowingly and willfully, with specific intent,
    and (5) that the statement was made in a matter within the jurisdiction of an
    agency of the United States. United States v. Calhoon, 
    97 F.3d 518
    , 523 (11th Cir.
    1996). Wire fraud under 
    18 U.S.C. § 1343
     (2000) requires a defendant's
    intentional participation in a scheme to defraud another of money or property and
    use of wires in furtherance of the scheme. Pelletier v. Zweifel, 
    921 F.2d 1465
    ,
    1498 (11th Cir. 1991). The scheme to defraud must consist of actions that would
    have deceived a reasonably prudent person, committed with a conscious, knowing
    intent to defraud. 
    Id. at 1499
    . Health care fraud under 
    18 U.S.C. § 1347
     requires
    knowing and willful execution of or attempt to execute a scheme to defraud a
    health-care benefit program in connection with delivery of or payment for health
    care.
    II.
    In 1999, Mitchell established a medical clinic, Family Physical Medicine,
    with a business plan similar to clinics Mitchell operated in Houston. Family
    Physical Medicine entered into an agreement with Mitchell's company MLM, Inc.
    for MLM to do the Atlanta clinic's Medicare billing. Mitchell's sister, Stephanie
    Locke, was named as Director of the clinic. When the clinic commenced
    operations in July 1999, it employed Mitchell's brother-in-law, Bruce Locke, as
    5
    Vice President for sales; an office manager, Valencia Boone; a physician, Dr.
    Stephen Dawkins, who worked six to eight hours per week, as medical director;
    another physician, Dr. Green; and a physical therapy technician, Curley Daniel.
    The clinic's method of doing business was that Bruce Locke would attend
    health fairs frequented by senior citizens and encourage them to sign up for
    physical therapy. Dawkins would then go to the patient's home, examine the
    patient, and develop a treatment plan for physical therapy. The physical therapy
    technician would then go to the patients' homes alone and perform the therapy.
    Dawkins testified that he was not responsible for supervising the physical therapy
    technicians who performed the therapy. His employment contract with the clinic
    described his duties as "performing initial, as well as, follow-up evaluations;" it
    said nothing about supervising the therapy. Dawkins testified that after
    developing the treatment plan, he did not "in any way interact with a therapist,"
    although he also said on cross examination that he made follow-up visits to the
    patients and so did Dr. Green. Curley Daniel denied knowing Dr. Dawkins,
    although she was apparently the only technician working for the clinic in July
    1999. Likewise, Dr. Dawkins testified that he never knew Daniel. Daniel said
    that the doctors did not supervise her when she was out of the clinic. Although
    she said that she conducted therapy in accordance with the doctors' instructions,
    6
    those instructions were relayed to her through Boone or Stephanie Locke when
    she was going to the patients' homes. Valencia Boone said Dr. Dawkins's duty
    was "only to make that first assessment" of the patient's needs. Boone wasn't sure
    Dawkins saw the patients' charts after the technician began treatments "unless [the
    technician] had some sort of question or if they felt like the patient needed
    something different. Then they would contact Dr. Dawkins to find out what they
    should do."
    Physical therapy technicians are minimally-trained, low-paid workers; it is
    undisputed that under Medicare regulations, physical therapy technicians must
    work under the direction of a skilled provider (a medical provider who is licensed
    and enrolled with Medicare) for Medicare to pay for their services. In contrast, a
    licensed physical therapist has a college degree in physical therapy and can work
    as a skilled provider in his or her own right.
    By October or November 1999, Boone had begun to question whether it was
    permissible to use technicians rather than licensed physical therapists. About that
    time, Curley Daniel told Mitchell that "we needed a physical therapist on premises
    with us," but she did not explain at trial why she thought so. Daniel said Mitchell
    told her, "If you don't like what's going on here, you can basically, like, leave."
    Boone overheard the conversation and asked Mitchell about whether it was
    7
    permissible to have technicians do the work of therapists; he assured her that it
    was fine and that was how his clinics in Texas did business. At the end of 1999,
    Valencia Boone and Dr. Dawkins quit working for Family Physical Medicine.
    After Boone left, Mitchell's sister, Stephanie Locke, took over as office
    manager at the beginning of 2000. Stephanie Locke changed the clinic's method
    of doing business by providing the physical therapy services inside the clinic.
    During this time, the clinic had a number of personnel come and go. Dr. Shannon
    Fields testified that he began working for the clinic at the end of 1999 or
    beginning of 2000 and that the clinic was in transition to providing the physical
    therapy at the clinic building. Dr. Fields testified that he worked 15-20 hours per
    week doing physical exams and case histories and observing what he called the
    "therapist's" work. Fields said a Dr. Omiago alternated days with him for some
    unknown period of time, and that the clinic also hired a physician's assistant, Troy
    Johnson. Fields said the clinic hired another physician, Dr. DeAlbuquerque, about
    a month before Fields resigned. Curley Daniel and technician Karene Lamoi
    Benoit testified that after the clinic began treating patients in-house, the doctors
    did supervise them and they were told not to treat patients unless a physician was
    present in the clinic.
    8
    After Boone and Dr. Dawkins quit working for Family Physical Medicine,
    they worked together in another business. Stephanie Locke asked Boone if she
    could get Dawkins's signature on some documents he had failed to sign while he
    worked at Family Physical Medicine. Dawkins let Locke have his signature
    stamp. Family Physical Medicine affixed his stamped signature to records relating
    to services provided after he left. Dawkins did not authorize this use of the stamp.
    Throughout its existence, Family Physical Medicine experienced severe
    financial difficulties. Of approximately $2.4 million in Medicare billings,
    Medicare only paid $490,828.22, apparently due at least in part to the clinic's
    inability to submit the bills properly. The clinic went out of business sometime in
    the second half of 2000.
    III.
    This case presents two kinds of alleged false statements: (1) submission of
    claims for services that were not eligible for Medicare coverage, and (2)
    submission of claims based on forged documentation, in particular, the use of a
    doctor's signature stamp without his permission. The first type of statement was
    allegedly deceptive by virtue of the fact that the claim submitted was not allowable
    under the law at the time the claim was filed. See United States v. R&F Props. of
    Lake County, Inc., -F.3d-, No. 04-15283, 
    2005 WL 3557420
    , at *5 (11th Cir. Dec.
    9
    30, 2005) ("Medicare claims may be false if they claim reimbursement for services
    or costs . . . that . . . are not reimbursable . . . ."); United States v. Calhoon, 
    97 F.3d 518
    , 529 (11th Cir. 1996) (crux of 
    18 U.S.C. § 1001
     offense was "the filing of
    reports intended and designed to deceive and mislead the auditors for the purpose
    of obtaining reimbursement of costs Calhoon knew to be at least presumptively, if
    not clearly, non-reimbursable"). It was therefore incumbent on the government to
    introduce evidence of what the Medicare laws and regulations permitted and
    forbad during the period alleged in the indictment in order to establish both that
    the claims were deceptive and that Mitchell acted with scienter. "In a case where
    the truth or falsity of a statement centers on an interpretive question of law, the
    government bears the burden of proving beyond a reasonable doubt that the
    defendant's statement is not true under a reasonable interpretation of the law."
    United States v. Whiteside, 
    285 F.3d 1345
    , 1351 (11th Cir. 2002); accord United
    States v. Parker, 
    364 F.3d 934
    , 944-45 (8th Cir. 2004). In other words, if the law
    that makes a statement false is ambiguous and the defendant's statement was
    consistent with one reasonable interpretation of the law, the government must rule
    out the possibility that the defendant was acting in reliance on that interpretation.
    Some courts analyze the question as going to the element of false statement, e.g.,
    United States v. Rowe, 
    144 F.3d 15
    , 21-23 (1st Cir. 1998), and some as going to
    10
    the element of scienter, e.g., Minnesota Ass'n of Nurse Anesthetists v. Allina
    Health Sys. Corp., 
    276 F.3d 1032
    , 1053-56 (8th Cir. 2002) (civil false claims
    case).
    The district court considered the theories advanced by the government to
    establish that Mitchell' s businesses violated clear Medicare rules: (1) that the
    services were not billable because they had not been performed by a "skilled
    provider," and (2) that the services were not billable because in the second half of
    1999, the services had been provided by a technician in the patients' homes instead
    of in a clinic with a physician present.
    The government contends that "physical therapy provided by unlicensed
    technicians" was not billable under Medicare. Government Brief at 21. However,
    the government's evidence at trial indicated that this principle is overstated and
    that under some circumstances physical therapy technicians' services could be
    billed under Medicare.
    The government did not introduce any statute, regulation, policy or other
    written authority governing the circumstances under which physical therapy
    technicians' services could be payable under Medicare. It did adduce the
    testimony of an investigator, Karen Hurley, who testified generally that for
    physical therapy services to be billable to Medicare, "The services must be
    11
    medically necessary to treat an injury or an illness, and they must be provided by a
    skilled provider." Hurley testified that a physician or physical therapist can be a
    "skilled provider." She said, "A group that is enrolled with medicare can only bill
    for services for physicians that are employed by that group and who are licensed
    and enrolled with Medicare."
    Hurley's testimony taken at face value would thus support the conclusion
    that it is flatly illegal to bill Medicare for services provided by a technician, rather
    than a skilled provider. However, Hurley herself contradicted this conclusion.
    She stated that the requirements for billing medical procedures would be set forth
    by Medicare in local medical review policies and she identified such a policy for
    physical therapy. The government failed to introduce the policy into evidence and
    the policy, identified as Exhibit 10, was dated July 11, 2000, which would have
    been after the relevant date for the bills at issue. Nevertheless, Hurley was
    allowed to testify that the policy stated:
    For claims submitted by a physician, services performed by
    nonemployees or not under a physician's direct supervision are not
    covered. . . . Services that do not require the professional skills of a
    physician to perform or supervise them are not medically necessary.
    Q: And what is the import of that policy statement?
    A: It indicates that the services should be performed by a skilled
    provider or under his direct supervision.
    12
    (emphasis added). Hurley's testimony thus establishes that services do not have to
    be performed by the physician if the physician "directly" supervises them, so the
    government's evidence does not establish a per se rule that technicians cannot
    perform the therapy. Moreover, the Assistant United States Attorney arguing this
    appeal admitted that it was permissible to use technicians under the supervision of
    a doctor. Therefore, the district court did not err in concluding the government
    had failed to prove that treatment by the technicians was per se illegal.
    The government also contends that the services rendered in 1999 were non-
    billable on the ground that they were performed by a technician in the patients'
    homes instead of at a clinic with a physician present. We must determine whether
    the rule as set out in Hurley's testimony clearly prohibits billing for technicians'
    services not rendered within the clinic with a doctor present.
    The question of whether the law was ambiguous is one for the court, not the
    jury. United States v. Prigmore, 
    243 F.3d 1
    , 18 (1st Cir. 2001). In a civil False
    Claims Act case this Circuit recently considered whether non-physician
    employees' services could be billed as "incident to" the services of a physician
    under the Medicare program if the physician was not present on the premises at
    the time of the service. In United States v. R&F Properties of Lake County, Inc., -
    F.3d-, No. 04-15283, 
    2005 WL 3557420
    , at *5 (11th Cir. Dec. 30, 2005), we held
    13
    that the regulations and policies existing before 2002 were ambiguous.
    Unfortunately, we must decide the question on the record before us, which is
    limited to Hurley's statement of the law, unlike the fulsome record provided in
    R&F. A reasonable person could interpret "directly supervise" to apply where a
    physician drew a treatment plan to be followed by a technician, consulted with the
    technician before and after each treatment, was available for consultation by
    telephone or pager during the visit, and conducted follow-up examinations to
    ascertain the patient's progress, even if the therapy occurred in the patient's home
    instead of in a clinic where the physician was present. Thus, the words "direct
    supervision" in the record are ambiguous with regard to whether a home visit by a
    technician could be billable, and a reasonable person could interpret those words
    to extend to oversight of technicians conducting home visits.
    Since the law as presented by Investigator Hurley was ambiguous, it was up
    to the government to show that the language in context would have been
    understood to preclude the kind of claims Family Physical Medicine filed. In
    short, the government had to show that at the time of the claims, the government
    and Mitchell understood "supervision" to hinge on whether the physician was
    present in the same premises with the technician. See R&F, 
    2005 WL 3557420
    , at
    *5-6.
    14
    Hurley testified on cross examination that it was necessary for the physician
    to be at the site where services were provided in order to bill Medicare for the
    services of non-physician employees, including physical therapy technicians: "The
    physician must also be present in the office when the services are provided."
    However, she did not refer to any statute, regulation or other published authority
    that enshrined this rule or state when the rule first became effective. Similarly,
    Valencia Boone testified that she had eventually learned, "A physical therapy tech
    can only work inside a clinic under the direct supervision of a physician," but she
    did not identify the basis for her opinion or state when she formed the opinion.
    Curley Daniel testified that she told Mitchell that "we needed a physical therapist
    on premises with us," but she did not state the basis for this opinion.
    There was evidence at trial that a change in Medicare rules caused Mitchell
    to change the clinic's practice of providing therapy in the patients' homes. Bruce
    Locke testified that after Family Physical Medicine began business, there were
    "some Medicare laws and changes and stuff, and we had to start bringing the
    patients to the clinic." Locke said he was not personally familiar with the rules,
    but that "you could hear the ruckus" the week a letter came changing the rules.
    Locke explained,
    15
    Well, there was some sort of Medicare form that came in the
    mail, and Michael had some people review it, some more of the inept
    people, I guess, because he had some more people review it, and then
    he came to the conclusion that we'll bring the patients to the clinic;
    thus, increasing the cost to do business because he had to hire the
    transportation to bring them there.
    The government's investigator Priscilla Boyd also confirmed the idea that
    the rules governing billing for services provided by physician's employees were
    changed or clarified in 2000:
    Q: What we're talking about is what services can be provided under
    the supervision of a doctor.
    A: Right.
    ....
    Q: And what the rules and regulations are that govern that, correct?
    A: Correct.
    Q: And what you can bill for and what you can't, correct?
    A: Correct.
    Q: All right. Now, the only point I wish to make is that in the middle
    of 2000, that newsletter put out by Medicare acknowledged that in the
    industry, there was a lot of confusion as to what that meant and what
    the proper application of that term was, correct?
    A: That's what the newsletter indicates.2
    In sum, rather than introducing any written statute, regulation, policy or
    other authority establishing that a technician's services pursuant to a physician's
    orders were not "directly supervised" by the physician if the physician was not
    physically present in the same clinic, the government relied on testimony of an
    2
    The newsletter identified as Defendant's Exhibit 1 was not introduced into evidence.
    16
    investigator. That investigator did not identify when the rule she cited became
    effective. Other testimony by government witnesses established that there was a
    change or clarification in the applicable rules well into the alleged conspiracy
    period, following which Family Physical Medicine changed its practices to comply
    with Mitchell's new understanding that technicians had to be in the same building
    with the physician. On this record, the government did not bear its burden of
    proving that Family Physical Medicine intentionally submitted bills that were not
    legally payable solely by virtue of the technician's treatment occurring in the
    patient's home.
    We emphasize that we express no opinion as to what the actual state of the
    Medicare laws, regulations, or policies was at the time of the conduct charged.
    Neither party supplied any direct evidence of what the law required at any
    particular time other than the testimony we have discussed, and our business is
    limited to the state of the record before the jury. We are mystified as to why the
    government neglected to introduce such regulations if the rule was clear at the
    time the services were rendered. Nevertheless, on the record before us, the
    government has not borne its burden of proof either that the claims were illegal at
    the time filed or that Mitchell had the necessary scienter in connection with the
    filings merely because the services took place in the patients' homes.
    17
    Although we have determined that the district court's assessment of the
    government's two principal theories of guilt was correct, it is nevertheless
    necessary to consider whether the government proved that Mitchell's businesses
    were billing for technicians' services that no one reasonably could have thought
    were "directly supervised" by a physician. There was evidence that Dr. Dawkins
    did not supervise the technicians because he did not believe it was his
    responsibility to do so. Although Dr. Dawkins testified that he examined the
    patients, drew up the plan for physical therapy, and conducted follow-up
    examinations on the patients, the record shows that there was no contact
    whatsoever between Dr. Dawkins and Curley Daniel, the technician who began
    working in July 1999. Dr. Dawkins testified that after he developed the treatment
    plan, he was not responsible for supervising the "therapists" and that he did not
    interact with the technician in any way. No one asked him whether he was aware
    that the therapy was being performed by a "technician" rather than a "therapist."
    Curley Daniel testified that when she began working for Family Physical
    Medicine, there was no physician on staff, although she said she had heard of Dr.
    Dawkins. She testified that she did not know Dr. Dawkins and she did not work
    with him. However, she later identified Dr. Green's signature and agreed that he
    had done the evaluation of a patient whose records were being discussed. She did
    18
    say that she could not go out to treat a patient without an evaluation and
    instructions from a doctor and that the doctor had to examine the patient
    periodically to assess the progress of the treatment. She said she got the doctor's
    instructions from her "supervisor"–apparently meaning Boone or Stephanie Locke.
    Another technician, Karene Lamoi Benoit, testified that she began work in August
    1999 and she worked with Dr. Dawkins.
    We conclude that there is no reasonable interpretation of "direct
    supervision" that would cover Dr. Dawkins's relationship with Curley Daniel, and
    indeed, that Dr. Dawkins did not consider himself to be supervising Curley Daniel,
    but appears to have been under the impression that the therapy was being
    performed by a licensed physical therapist. Mitchell, however, gave Boone
    instructions to hire technicians and it was technicians, not physical therapists, that
    the clinic sent to the patients' homes. This evidence would allow a reasonable jury
    to find that the claims filed in 1999 for in-home services by technicians were
    fraudulent and Mitchell knew them to be so.
    The government further contends that even after the clinic began providing
    its services in-house with a physician present, there was no supervision of the
    technicians. However, the technicians testified that after the therapy was moved
    into the clinic, Dr. Fields and Dr. DeAlbuquerque did supervise them. The
    19
    government contended at oral argument that inadequate supervision could be
    inferred from the fact that Dr. Fields only worked about twenty hours a week;
    however, the government admitted that there was another doctor on staff at the
    time, and the government neglected to introduce evidence about how much that
    doctor was at the clinic. The government also contends that Dr. Fields established
    lack of supervision when he said that he did not follow up to assure that patients'
    therapy was discontinued when he ordered it to be; however, since there was no
    showing that any patient received therapy after Fields ordered therapy
    discontinued, Fields's statement would not support an inference of conspiracy to
    commit fraud.
    In sum, we conclude that the government did indeed adduce evidence that in
    1999 Mitchell's clinic was engaged in a systematic practice of billing for the
    services of unlicensed technicians whose work was not directly supervised by a
    skilled provider. Though the government's more specific theories failed for lack
    of evidence, the record was sufficient to allow a reasonable finder of fact to
    conclude that Mitchell conspired to engage in a fraudulent scheme to obtain
    Medicare payments for services performed without a sufficient degree of
    physician supervision.
    20
    IV.
    There was evidence at trial that Family Physical Medicine used Dr.
    Dawkins's signature stamp on Medicare claims without his authorization to do so.
    The question is whether there was any evidence linking Mitchell to the misuse of
    the stamp.
    The government indicted Stephanie Locke alone on five charges of false
    statements based on use of this stamp, but she was determined to be physically
    incapable of proceeding to trial and so her case was severed. Whatever Stephanie
    Locke's culpability may have been, the government did not show that Mitchell had
    anything to do with the misuse of the stamp. Valencia Boone said that to the best
    of her knowledge, Mitchell had nothing to do with getting the stamp and she had
    no reason to think he was aware that it had happened. There was no evidence
    tying Mitchell to the unauthorized use of the stamp. The district court did not err
    in concluding that the evidence was insufficient to support the conspiracy verdict
    on the stamp theory.
    V.
    Because we conclude that the government proved that Mitchell conspired to
    engage in a fraudulent scheme to bill for the services of inadequately supervised
    technicians, we must reverse the district court's entry of judgment of acquittal.
    21
    Accordingly, we must consider whether the district court's alternative order of a
    new trial was permissible.
    We review for abuse of discretion a district court's grant of new trial on the
    ground that the verdict was against the weight of the evidence; however, the
    particular abuse of discretion standard employed in this situation is more searching
    and rigorous than the name would suggest. See United States v. Hernandez, -
    F.3d-, No. 04-16663, 
    2005 WL 3525613
    , at *7 (11th Cir. Dec. 27, 2005); Butcher
    v. United States, 
    368 F.3d 1290
    , 1297 (11th Cir. 2004). While the district court
    may weigh the evidence and assess the credibility of the witnesses, the district
    court may not set aside the verdict unless the evidence preponderates so heavily
    against the verdict that it would be a miscarriage of justice to let the verdict stand.
    Butcher, 
    368 F.3d at 1297
    .
    Here, the government pursued various theories of guilt that failed entirely
    for lack of evidence. The one theory that supports the conspiracy conviction was
    based on an inference that Mitchell knew that Dr. Dawkins was not providing
    supervision of the technicians. This inference was tenuous and the district court
    did not abuse its discretion in granting the motion for new trial.
    Accordingly, the judgment of acquittal is REVERSED and the order
    granting a new trial is AFFIRMED.
    22
    HULL, Circuit Judge, specially concurring:
    I concur in the judgment only.
    23