This appeal from a guilty plea and sentence requires that we consider the process due a defendant whose behavior may raise questions concerning his mental competency.
I.
A federal grand jury for the District of New Hampshire indicted José Lebrón on ten counts stemming from his two armed robberies of a pawnshop and a bank in Manchester, New Hampshire. His co-defendants, Paul Hazen and Frank Jones, pled guilty to possession of a firearm by a convicted felon, 18 U.S.C. § 922(g). The court imposed sentence and neither of them appealed. Lebrón requested counsel under the Criminal Justice Act, 18 U.S.C. § 3006A. However, he vehemently objected to his court-appointed counsel and filed several motions with the court requesting new counsel. A magistrate judge denied the motion, finding that Lebrón had not articulated sufficient reasons. The magistrate informed Lebrón that he could either retain his appointed counsel, or proceed pro se.
At a hearing on Lebrón’s motion for a new court-appointed counsel, the district court found no valid reason to substitute counsel. The court informed Lebrón that he could proceed pro se and that his court-appointed counsel would stand by, and take over the ease if Lebrón did not conform to courtroom rules. Lebrón lost his temper, and his behavior prompted the marshals to handcuff him before the hearing ended. The court denied his motion for reconsideration. Le-brón then filed a Renewed Motion for Reappointment of Counsel, in which he asserted that there was medication he could take which could “affect his ability to be aware of exactly what is happening around him.”
On May 10,1994, Lebrón represented himself during jury selection. Although he initially asked for, and was denied, an interpreter, Lebrón was able to communicate with the jury. Several of his objections to jury members were granted. After jury selection, the court held an ex parte session with Lebrón and his counsel to enable them to air the disagreements between them without compromising the attorney-client privilege. At this session, the judge informed Lebrón that he had done a good job in jury selection, but that he was “not competent to represent himself in the sense he’s not aware of fundamental issues that ought to be raised on his behalf.” Lebrón concedes that the district court meant this statement to refer to Le-brón’s competence as an attorney, not to Lebrón’s mental competence. At the same ex parte session, Lebrón’s counsel informed the court that Lebrón used to receive prescriptions for thorazine (an antipsychotic) and trazodone (an antidepressant) from the Veteran’s Administration hospital, and that he would like to take these drugs during the trial.
In response, the judge alerted the Government that Lebrón had a previous psychiatric history. He believed that this might be relevant to the defendant’s ability to intelligently waive- his right to counsel. The court then held a hearing later that day to determine the issue of Lebrón’s competency, and whether Lebrón should be permitted to take his requested drugs during trial. The court took testimony from Dr. Nathan Sidley, the prison psychiatrist. Sidley stated that he had briefly reviewed Lebrón’s Veteran’s Administration medical records, which revealed a possible diagnosis of schizophrenia in the 1970s. Sidley had attempted to meet with Lebrón, but Lebrón terminated their meeting within the first five minutes, upon learning that their discussion would not be confidential. Sidley concluded that, based on *31these facts, Lebrón was not psychotic, and was competent to stand trial. He further concluded that any possible benefits from the drugs Lebrón requested were outweighed by the detriments of giving him massive quantities needed without sufficient time for the drugs to build up in his bloodstream.
Lebrón then testified that he was using heroin and Valium, and that he had both drugs in his system at the time. Two days later, the district court judge issued an order which continued the trial date, permitted Le-brón’s counsel to withdraw, and appointed Paul Twomey as new counsel for Lebrón.
The next day, the Government and Twom-ey jointly filed a request for a psychiatric evaluation pursuant to 18 U.S.C. § 4241, which the court granted. The parties agreed that Dr. Albert Druktenis should perform the evaluation. Druktenis met with Lebrón and evaluated him pursuant to the court’s order to determine both Lebrón’s sanity at the time of the offense, and his competency to stand trial now. Druktenis concluded that Lebrón was not insane at the time of the offense, and that he was competent to stand trial. He noted that Lebrón’s personality was manipulative, but that he was aware of the charges against him, and had been able to speak intelligently, lucidly and logically at court hearings. Druktenis also addressed the issue of Lebrón’s current medications, and noted that they “would not cloud his thinking in any substantial way and, in fact, are probably helping him by reducing anxiety and agitation.”
After the psychiatrist submitted this report, Lebrón withdrew his motion to dismiss based on incompetency, and the parties reached a plea agreement. Under this agreement, Lebrón would plead guilty to two counts of use and carrying of a firearm in violation of 18 U.S.C. § 924(c), and the Government would dismiss the remaining eight counts.
The court conducted a change of plea hearing on October 3, 1994. Before the judge entered the courtroom for the hearing, Le-brón threw a pitcher of water at the case investigators, narrowly missing one agent. Soon thereafter, the hearing proceeded, with the court stating that it understood there was “no issue at this point with regard to the defendant’s competence.” Both counsel agreed that Lebrón was competent. Defense counsel then added that he had come to that conclusion himself independently after reviewing the psychiatric report. The court then asked Lebrón if the Government’s proffer of the evidence to the charges was correct. At first Lebrón claimed that he could not remember any of the events. On further questioning, he admitted to the conduct. After fully advising Lebrón of the rights he would waive by pleading guilty, the court accepted the plea.
The court sentenced Lebrón to imprisonment for 240 months on one count and 60 months on the other, to be served consecutively, three years supervised release with a condition of treatment for his chemical dependency, $500 in restitution, and a $100 special assessment. Lebrón appeals, raising as his sole issue whether the district court denied him due process by not holding a hearing under 18 U.S.C. § 4241 to determine his competency when he changed his plea. We affirm.
II.
The conviction of a criminal defendant while he is legally incompetent violates due process. Pate v. Robinson, 383 U.S. 375, 378, 86 S.Ct. 836, 838, 15 L.Ed.2d 815 (1965). The test for a defendant’s mental competency to plead guilty is the same as that of a defendant’s competence to stand trial. United States v. Harlan, 480 F.2d 515, 517 (6th Cir.1973). That test, as set forth by the Supreme Court, is whether the defendant understands the proceedings against him and has sufficient present ability to consult with his lawyer with a reasonable degree of rational understanding. Dusky v. United States, 362 U.S. 402, 80 S.Ct. 788, 4 L.Ed.2d 824 (1960).
To assist courts in making this test, Congress has established certain procedures. Section 4241 of Title 18 of the United States Code provides the relevant reference in matters of a criminal defendant’s competency to stand trial. 4241(a) provides in pertinent part:
*32... [T]he defendant or the attorney for the Government may file a motion for a hearing to determine the mental competency of the defendant. The court shall grant the motion, or shall order such a hearing on its own motion, if there is reasonable cause to believe that the defendant may presently be suffering from a mental disease or defect rendering him mentally incompetent to the extent that he is unable to understand the nature and consequences of the proceedings against him or to assist properly in his defense.
In the present case, no such hearing was held or requested. Lebrón, however, asserts that the district court had reasonable cause to believe that he, Lebrón, was suffering from a mental disease or defect. Therefore, he claims, the court violated his due process rights by not ordering a competency hearing on its own motion.
By the language of the statute, a district court judge has a duty to order a competency hearing only if there is “reasonable cause” to doubt the defendant’s mental competence. A district court’s findings about the competency of a defendant after holding such a hearing will be upheld unless they are clearly erroneous. United States v. Collins, 949 F.2d 921, 927 (7th Cir.1991). When there has been no hearing, and no examination of the defendant whatsoever, the appellate court reviews the district court’s findings comprehensively. Id. This ease falls in between these two standards.
Although the trial judge did not order a formal hearing, he carefully and painstakingly sought, commencing -with the defendant’s initial appearance before him, to ascertain whether there was any question of mental competency and to protect Lebrón’s due process rights. To this end, the judge discharged the jury, continued the trial and ordered that the defendant be examined by a psychiatrist. Thus, the court had before it the psychiatrist’s report, as well as Lebrón’s Veteran’s Administration medical records and the testimony of the prison psychiatrist. In addition, defendant’s counsel also had concluded that Lebrón was mentally competent to enter a guilty plea. Because the judge had substantial facts before him when he made findings as to defendant’s competency, we -will give his decision not to hold a competency hearing due deference.
Dr. Druktenis, after conducting a two-hour interview with Lebrón, concluded that Lebrón was competent to stand trial. If a psychiatrist has determined that a defendant is competent, a court is not required to hold a further evidentiary hearing absent extenuating circumstances. See United States v. Prewitt, 553 F.2d 1082, 1086 (7th Cir.1977). It was well within the district court’s discretion to conclude that such circumstances were not present here.
Lebrón points to his irrational and outrageous behavior in the courtroom. He claims that this should have alerted the district court judge that Lebrón was incompetent to enter a plea. Lebrón had been handcuffed at the April hearing. Also, at this hearing, he had pleaded to be removed from the courtroom, stating, “I have too much trouble on my mind, your Honor.” At the change of plea hearing, Lebrón threw a pitcher full of water at case investigators. Such behavior may be uncontrolled, manipulative, or even theatrical. It is not determinative of competency. Agitated or violent courtroom antics alone do not mandate a finding by the trial court of reasonable cause. United States v. Marshall, 458 F.2d 446, 450 (2d Cir.1972). In Marshall, the defendant behaved belligerently in the courtroom, shouted obscenities, and threw not only a water pitcher, but also a chair in the courtroom. Two psychiatric reports, however, disclosed that the defendant was competent, and predicted that he would engage in disruptive behavior. The Court of Appeals held that the trial court was within its discretion in failing to hold a competency hearing. Similarly here, two psychiatrists examined Lebrón and found him competent.1
*33Lebrón further argues that his medical record and history of taking medications should have provided the necessary reasonable cause. However, past treatment or drug use is not determinative of present competency. United States v. Pryor, 960 F.2d 1 (1st Cir.1992). Lebrón’s Veteran’s Administration records were from the 1970s, twenty years ago. Moreover, Dr. Druktenis expressly addressed the issue of the medications Lebrón was currently taking and noted that they would not cloud his thinking.
In summary, although Lebrón occasionally behaved belligerently and has a medical history showing past possible mental illness and past drug use, these are more than counterbalanced by Dr. Druktenis’ report of Lebrón’s present competence, his counsel’s assertion that Lebrón was competent to enter the plea, and the trial court’s careful plea colloquy ensuring that Lebrón understood the charges against him, and the consequences of pleading guilty to them. All of these factors pointed unequivocally to the defendant’s mental competency. There was no reasonable cause for the trial court to hold a hearing when all the information from the psychiatrist, the defense counsel, and the judge himself were in agreement. See id. United States v. Pryor, 960 F.2d 1, 2 (1st Cir.1992) (where district court had an opportunity to observe defendant rationally and vigorously participating in his defense at a pretrial proceeding, and psychiatrist found that defendant was oriented as to time and place, there was no cause for the court to hold a further hearing, under section 4241 despite defendant’s history of drug problems and psychiatric treatment).
As this court noted in Hernández-Hernández v. United States, 904 F.2d 758 (1st Cir.1990), a ruling that this case provides reasonable cause for a hearing would “come close to requiring district courts to order competency hearings sua sponte in every case where a defendant has some history of psychiatric treatment and, even vaguely, mentions the problem.” Id., at 760 (quoting Figueroa-Vázquez v. United States, 718 F.2d 511, 512 (1st Cir.1983). We decline to impose such a heavy, unnecessary, and costly burden on district courts.
III.
We hold that when a qualified psychiatrist examines a defendant before he enters a plea to criminal charges, and the psychiatric report and other pertinent current information reveal that the defendant is competent to stand trial, it is not reversible error for a district court to fail or refuse to conduct a formal hearing under the provisions of 18 U.S.C. § 4241(a). Accordingly, the judgment of conviction and sentence is affirmed.
. Lebrón argues that Dr. Sidley's opinion should be discounted because their meeting was inadequate. It is true that Sidley had little contact with Lebrón, and that his review of Lebrón's medical records was cursory. We agree that Dr. Sidley’s testimony alone would not have sufficient indicia of reliability to obviate the need for further findings. However, Dr. Druktenis con*33ducted an extended face-to-face examination of Lebrón.