Statistical command discipline data may be admissible to support selective prosecution claims, but faces significant foundational and relevance hurdles. The defense must show statistics compare similarly situated individuals, accounting for rank, offense types, and circumstances. Raw numbers without context rarely suffice. Admissibility requires demonstrating reliable data collection methods, appropriate comparison groups, and statistical significance suggesting discriminatory patterns rather than random variation.
Authentication challenges include obtaining complete data sets and establishing collection methodology. Commands may resist releasing comprehensive discipline statistics citing privacy or administrative burden. Freedom of Information Act requests help but face timing constraints. Expert testimony often becomes necessary to explain statistical significance and control for variables affecting charging decisions. Simple disparities don’t prove discrimination without accounting for legitimate factors influencing prosecutorial discretion.
Even when admitted, statistics alone rarely prove selective prosecution without evidence of discriminatory intent. They provide circumstantial support requiring additional evidence of bias. Military judges carefully limit statistical evidence scope to prevent trials becoming broader command effectiveness challenges. Jury instructions emphasize that disparate impact doesn’t equal intentional discrimination. The most effective use combines statistics with specific comparator examples and evidence suggesting discriminatory motivation. Success requires sophisticated statistical analysis beyond simple numerical comparisons.