United States v. Tingle, 880 F.3d 850

Police conducted controlled buys and executed a search of Ronald Tingle’s residence, seizing 165 grams of methamphetamine, digital scales, cash, and eight firearms (one loaded handgun found on a desk with drugs and money).
Grand jury indicted Tingle for possession with intent to distribute and multiple distribution counts; government sought superseding indictments after Tingle rejected a plea offer that warned additional charges would follow.
Tingle moved to suppress search evidence (denied), sought grand jury materials (denied), and moved to dismiss superseding charges for prosecutorial vindictiveness (denied without hearing).
At trial, DEA Agent Steele (with extensive law‑enforcement/drug investigation experience) testified about drug quantity, packaging, and gun placement; the district court followed a local practice of not formally labeling witnesses as experts but gave a jury instruction on expert testimony.
Tingle admitted possession but denied distribution; jury convicted on all counts. Tingle appealed raising four issues: expert qualification/admission, improper testimony on intent, access to grand jury materials, and prosecutorial vindictiveness.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Admission of Agent Steele as expert without proper vetting	Trial court failed to assess Steele’s qualifications or hold a Daubert inquiry	Steele’s training/experience plainly qualified him; district practice explained	No plain error; Steele qualified and testimony admissible, but court’s practice of not identifying experts is problematic
Agent Steele testified on defendant’s mental state (intent)	Steele improperly opined on Tingle’s intent to distribute and use of gun to protect drugs	Steele gave circumstantial, experience‑based testimony comparing quantities and item placement, not a direct opinion on mens rea	No plain error; testimony was permissible circumstantial expert evidence, not forbidden opinion on mental state
Disclosure of grand jury materials	Tingle needed access to grand jury transcripts to prepare defense	Grand jury materials are presumptively secret; no particularized need shown	Denial affirmed; no abuse of discretion under Rule 6(e) and Douglas Oil test
Dismissal for prosecutorial vindictiveness after plea rejection	Superseding indictments were filed as punishment for rejecting plea; due process violated	Prosecutor warned charges would be filed if plea rejected; adding charges after plea rejection is permissible	Denial affirmed; no presumption of vindictiveness for pre‑trial charging decisions and no evidentiary showing to require a hearing

Daubert v. Merrell Dow Pharm., 509 U.S. 579 (1993) (trial court must ensure expert testimony is reliable and helpful)
Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999) (Daubert gatekeeping applies to all expert testimony)
United States v. Winbush, 580 F.3d 503 (7th Cir. 2009) (expert testimony comparing user v. distribution quantities is permissible circumstantial evidence of intent)
United States v. Blount, 502 F.3d 674 (7th Cir. 2007) (officer testimony about guns protecting drugs aids jury inference and does not directly opine on mens rea)
Douglas Oil Co. v. Petrol Stops Northwest, 441 U.S. 211 (1979) (standard for disclosing grand jury materials requires particularized need outweighing secrecy)
Alabama v. Smith, 490 U.S. 794 (1989) (prosecutor may threaten and follow through with additional charges if defendant refuses plea)
United States v. Goodwin, 457 U.S. 368 (1982) (no presumption of vindictiveness for pretrial prosecutorial charging decisions)
United States v. Phillips, 596 F.3d 414 (7th Cir. 2010) (plain error review applies when expert admission objections are raised first on appeal)
Walker v. Sheahan, 526 F.3d 973 (7th Cir. 2008) (abuse of discretion standard for grand jury disclosure rulings)