U.S. COAST GUARD

All marine employers (the owner of a vessel, the managing operator, the charterer, the agent, the master, or other person in charge) and employees operating commercial vessels are required to be in compliance with the DOT and USCG procedures for drug and alcohol testing (46 CFR parts 4 and 16).
 

https://www.uscg.mil

UPIC Labs can assist marine employers in developing and implementing compliant drug and alcohol testing programs for their employees based on USCG and DOT rules.