Prosecuting violations of Article 112a, Uniform Code of Military Justice (UCMJ),1 requires familiarity with urinalysis procedures, forensic toxicology, hearsay rules, and military case law interpreting Crawford v. Washington.2 This article will orient trial counsel to the general components of Article 112a, UCMJ, trials, beginning with identifying the controlled substance in the specification, collecting urine from the accused, transferring the urine specimen to a testing laboratory, and concluding with expert testimony from a forensic toxicologist.