United States v. Sherman Mitchell, 816 F.3d 865

DEA investigated a PCP distribution ring centered on Sherman Mitchell and associate Harvey Couser; shipments of amber liquid in large beverage bottles were sent from Los Angeles to an apartment Mitchell used in D.C.
Agents observed Couser retrieve multiple packages addressed to "Jane Mitchell" at the Onyx; controlled-delivery in Nov. 2012 produced four 64‑oz bottles, from which samples were taken and some bottles repacked for delivery.
Additional packages in Feb. 2013 (two separate shipments) and a July 2011 package (six bottles) were seized; DEA testing of samples found PCP concentrations sufficient to meet statutory thresholds in several bottles.
Mitchell was indicted on conspiracy and multiple possession-with-intent-to-distribute counts and convicted by a jury on Counts I–IV; district court sentenced him to lengthy terms of imprisonment; he appealed.
On appeal Mitchell primarily challenged (1) authentication/chain-of-custody for the laboratory-tested samples and (2) admission of summary-witness testimony summarizing voluminous phone records (Exhibit 30).

Issue	Plaintiff's Argument	Defendant's Argument	Held
Chain of custody for DEA lab samples	Mitchell argued gaps (unlabeled vials, lack of testimony by officers who sealed evidence bags, and no precise tracking from seizing agent to lab) undermined authentication and required exclusion	Government argued identification was supported by photographs, case/exhibit numbers, sealed evidence bags, lab intake tracking, and chemist testimony; any gaps go to weight not admissibility	Court affirmed admission: gaps were minor or sufficiently corroborated; any deficiencies went to weight and did not require exclusion
Use of summary witness (Amoroso) to link phone numbers/addresses to defendants	Mitchell argued Amoroso exceeded Rule 1006 scope by drawing inferences from her independent investigation and the court erred by not giving a limiting instruction	Government relied on Rule 1006 summary of voluminous phone records and permitted cross-examination; defense had prior chance to strip contested parentheticals from chart	Even if plain error, any error was harmless: cross-examination exposed limitations of Amoroso’s inferences and prejudice was not shown

United States v. Mejia, 597 F.3d 1329 (D.C. Cir. 2010) (chain-of-custody principles; need to eliminate reasonable possibilities of misidentification/adulteration)
United States v. Garcia, 757 F.3d 315 (D.C. Cir. 2014) (gaps in chain generally affect weight, not admissibility)
Melendez-Diaz v. Massachusetts, 557 U.S. 305 (2009) (discussing lab reports and confrontation issues; gaps normally go to weight)
United States v. Lemire, 720 F.2d 1327 (D.C. Cir. 1983) (standards and limits for admissible summary evidence under Rule 1006)
United States v. Fahnbulleh, 752 F.3d 470 (D.C. Cir. 2014) (summary exhibits must be accurate and introduced by the witness who prepared them)
United States v. Marcus, 560 U.S. 258 (2010) (plain-error standard and prejudice requirement)
Kotteakos v. United States, 328 U.S. 750 (1946) (standard for harmless error review)