Under 46 CFR Part 16, which of the following substances is NOT among those for which every collected specimen must be tested?

A. Cocaine
✓ BarbituratesCorrect
C. Phencyclidine (PCP)
D. Amphetamines

Why B is correct

46 CFR §16.113(b) lists exactly five substances: marijuana, cocaine, opiates, phencyclidine (PCP), and amphetamines. Barbiturates are not on the mandatory panel.

Cited:46 CFR §16.113

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