John Paul Jones was convicted in a jury trial of one count of conspiracy to distribute Schedule III and Schedule IV controlled substances in violation of 21 U.S.C. § 846 (1982), seven counts of distributing Schedule III and Schedule IV controlled substances in violation of 21 U.S.C. § 841(a)(1) (1982), and two counts of attempting to evade income taxes in violation of 26 U.S.C. § 7201 (1982). Jones contends on appeal that (1) his convictions under section 841(a)(1) cannot be sustained because, while working as a physician’s assistant, he prescribed the controlled substances to his patients for valid medical reasons under the authorization of a supervising physician; (2) his conviction for the conspiracy count placed him in double jeopardy; (3) the conspiracy charge is barred by the statute of limitations; and (4) the evidence is insufficient to sustain his conviction for attempting to evade income taxes. We disagree and therefore affirm.
I.
John Paul Jones and eight others were originally indicted on May 23, 1985 and charged with conspiring to distribute controlled substances. The indictment also charged Jones with being engaged in a continuing criminal enterprise (CCE), and with two counts of attempting to evade income taxes. The grand jury returned a superseding indictment on August 13,1985, which again charged Jones with conspiring to distribute controlled substances. Named as co-defendants in the conspiracy count were Vernon Webb, Carol Hansell, Ethel Clagett, Curtis Minton, and Francis J. Jones, Jr., a cousin of John Paul Jones. The superseding indictment dropped the CCE charge against John Paul, but added eight counts of distributing controlled substances and two counts of attempting to evade income taxes. One of the eight distribution counts was dismissed by the Government at trial.
The conspiracy charges against Webb, Hansell, and Minton were dismissed after all three pleaded guilty to other offenses. The Government prosecuted John Paul Jones, Francis J. Jones, and Ethel Clagett
*1485
in a joint trial. The jury acquitted Clagett, but convicted John Paul Jones of conspiracy, seven distribution counts, and the two tax evasion counts. The jury also convicted Francis Jones of conspiracy, a conviction that we reversed in a separate opinion for insufficiency of evidence.
United States v. Jones,
Viewed in the light most favorable to the Government,
see United States v. Hooks,
The Government produced evidence at trial that defendant earned approximately $21,000 in 1979 and $23,000 in 1980 from his illegal drug activities. Defendant failed to report these amounts as income on his federal tax returns filed for those years.
II.
Defendant first contends that, as a physician’s assistant, he was entitled to prescribe controlled substances as long as the prescriptions were for valid medical reasons and were authorized by his supervising physician, Dr. Webb. The evidence demonstrates, however, that he was not authorized by Dr. Webb to issue prescriptions.
Defendant alternatively argues that, even if the prescriptions were not authorized by Dr. Webb, his conviction cannot be sustained if he prescribed controlled substances for valid medical reasons. In support of this argument, defendant cites
United States v. Goldstein,
III.
Defendant was convicted in 1983 of conspiracy to manufacture and distribute phencyclidine (PCP). The conviction arose from defendant’s activities between November 1979 and April 1980, when he planned and set up a PCP lab with Gary Stroble and Michael Hultgren, and sold PCP manufactured at the lab. Defendant’s 1983 conviction was affirmed by this court in
United States v. Jones,
Defendant contends, on double jeopardy grounds, that the 1983 conviction should bar his present conviction for conspiracy to distribute Schedule III and Schedule IV controlled substances. He argues that the two conspiracies are really parts of a larger, unified conspiracy, and that convicting him once in 1983 and again in 1985 violated his right not to be placed twice in jeopardy for the same offense.
The Double Jeopardy Clause of the Fifth Amendment protects a criminal defendant from being tried twice for one offense.
United States v. Genser,
The burden of establishing a double jeopardy claim is on defendant.
United States v. Thompson,
The trial court, in response to defendant’s double jeopardy argument, specifically found that the offenses charged in 1983 and 1985 involved “separate and distinct conspiracies.” Ree., supp. vol. II, at 5-A. This conclusion is essentially a finding of fact, and we therefore review it under the clearly erroneous standard.
See United States v. Broce,
Several facts support our conclusion that the trial court’s finding of separate and distinct conspiracies is not clearly erroneous. First, the goals of the two conspiracies were completely different — the 1983 conviction involved a conspiracy to set up a PCP lab; defendant’s 1985 conviction was for conspiring to distribute prescription drugs from the Central Clinic. Second, the participants in the two conspiracies were, for the most part, different. The only link between the two offenses is Michael Hultgren, who participated in both illegal activities, and who testified that the Central Clinic drug diversion scheme was being used to finance the PCP lab. This link does not establish that there was only a single conspiracy. The evidence indicates that defendant was involved in separate agreements to achieve separate objectives, although the two activities shared some common elements. On this record, we cannot say that the trial judge was wrong in concluding that each conspiracy count required proof of facts that the other count did not,
see Nolan,
*1487 IV.
Defendant also argues that the 1985 conspiracy count is barred by the applicable statute of limitations, 18 U.S.C. § 3282 (1982), which provides that a defendant must be indicted within five years after an offense is committed. In order to fall within the statute of limitations, at least one overt act in furtherance of the conspiracy must have been committed within five years of the date of the indictment.
See Fiswick v. United States,
In support of his statute of limitations claim, defendant asserts that the controlling date should be the date of the superseding indictment, August 13, 1985. He argues that if a superseding indictment broadens the charges against a defendant, the filing date of the superseding indictment rather than the original indictment should control. Without addressing the merits of this argument as a general proposition, we note that the superseding indictment did
not
broaden the charges against defendant
with regard to the conspiracy count.
The conspiracy counts in both indictments are substantially the same. In fact, the superseding indictment
narrows
the conspiracy charge against defendant by describing a shorter period of illegal activity and by alleging fewer co-conspirators. Thus, we follow the general rule that the date of the original indictment, May 23, 1985, controls for purposes of the statute of limitations.
See United States v. Garcia,
The Government presented substantial evidence at trial that defendant used his position at the Central Clinic to call in false prescriptions to pharmacies, send runners to pick up the prescriptions, and use the drugs for illegal street sales. The evidence demonstrates that defendant’s runners knew the drugs they delivered to defendant were being acquired and distributed illegally. At least one of the runners, Donna O’Brien, testified that she knew the identities of the other runners working for defendant. Even if all of the runners were not aware of each other’s existence, this evidence tends to show that there was a single conspiracy, involving defendant and all of his runners.
See United States v. Worley,
The record indicates that at least one overt act in furtherance of the conspiracy was committed within five years of May 23, 1985. Defendant himself testified about a July 1980 transaction involving diverted drugs. According to defendant’s testimony, in July 1980 he gave Curtis Minton some Didrex that defendant had obtained through his false prescription scheme. The Didrex was used as payment for some Quaaludes that Minton had previously given to defendant to sell. Michael Hultgren, a witness for the Government, testified that on July 22, 1980, he picked up the false Didrex prescription, delivered it to defendant, and then witnessed defendant giving the drugs to Curtis Minton. Minton testified that he kept some of the Didrex and sold the rest.
Defendant attempts to discount the significance of this transaction by a two-part argument. First, Michael Hultgren at the time was a government agent; both parties agree that he could not, therefore, be considered a member of defendant’s conspiracy. Thus, defendant argues, obtaining the Didrex while using Hultgren as a runner cannot count as an overt act in furtherance of the conspiracy. Second, defendant argues that the Didrex payment to Minton was not an act in furtherance of the conspiracy, but was merely a single buyer-seller transaction that happened to involve diverted drugs.
On this record, we reject both of these arguments. Although the existence of a buyer-seller relationship, without more, does not constitute a conspiracy,
United States v. Watson,
V.
Finally, defendant contends that the evidence is insufficient to sustain his conviction for attempting to evade income taxes. In his brief he argues that “[w]illful failure to file a return, together with willful failure to pay the tax, does not, without more, constitute an attempt to evade income tax.” Brief of Appellant at 31 (citing
Spies v. United States,
AFFIRMED.
Notes
. Defendant also raises a procedural argument concerning the trial court’s treatment of his double jeopardy claim. He argues that once he made a prima facie showing that the present indictment and trial placed him in double jeopardy, he was entitled to an evidentiary hearing on his claim, with the burden falling on the Government to establish the existence of separate and distinct conspiracies.
See United States v. Garcia,
. Defendant argues alternatively that the Government’s delay in bringing an indictment violated his right to due process. This circuit has devised a two-part test to determine whether a preindictment delay violates due process: the defendant must show that he suffered "actual prejudice” resulting from the delay, and that the delay "was purposefully designed to gain tactical advantage or to harass” the defendant.
United States v. Jenkins,
