United States v. Brian Scott Dahl, 807 F.3d 900

Dahl pled guilty to conspiring to distribute >500g methamphetamine (21 U.S.C. §§ 841(a)(1), 846) and possessing a firearm in furtherance of a drug trafficking offense (18 U.S.C. §§ 922(g)(1), 924(c)(1)(A)); mandatory minimums totaled 204 months.
At the change-of-plea hearing Dahl exhibited memory lapses, attributed to a 2007 traumatic brain injury and oxycontin use; he nonetheless confirmed the plea’s factual basis and participated in the colloquy.
Over the following year the government declined to file a substantial-assistance motion; sentencing was delayed, and Dahl filed pro se letters complaining about counsel and requesting a neuropsychological evaluation.
Counsel later moved for a psychological examination and competency hearing and to withdraw the plea; the district court denied withdrawal (finding Dahl competent at plea) and, at sentencing, denied the competency motion.
Medical records documented "mild cognitive impairment" after the 2007 accident, including short-term memory and processing deficits, but contained no clear indication Dahl could not understand proceedings or assist counsel.
The district court imposed the 204-month mandatory minimum; Dahl appealed only the denial of the competency hearing/examination.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether the district court abused its discretion by denying a competency hearing/exam	Dahl argued medical records, his plea and sentencing behavior, and counsel’s observations showed reasonable cause to believe he was incompetent and warranted a §4241 evaluation/hearing	Government (and district court) argued the record showed only mild cognitive impairment and that Dahl nevertheless understood the nature/consequences of proceedings and could assist counsel	No abuse of discretion; no reasonable cause to believe Dahl was incompetent, so court properly denied competency hearing/exam

United States v. Casteel, 717 F.3d 635 (8th Cir. 2013) (standard for competency to stand trial and sentencing)
United States v. Ghane, 593 F.3d 775 (8th Cir. 2010) (mental illness does not necessarily establish incompetence)
United States v. Washington, 596 F.3d 926 (8th Cir. 2010) (district court must order competency hearing if reasonable cause exists; may order evaluation)
United States v. Crawford, 487 F.3d 1101 (8th Cir. 2007) (standard of review for denial of competency hearing is abuse of discretion)
United States v. Knohl, 379 F.2d 427 (2d Cir. 1967) (memory difficulties alone insufficient to establish incompetence)