Random drug testing is the most effective format with a growing number of corporations using this form of testing. The objective of a random drug test is deterrence, as the threat of detection is much higher versus other testing methods. The goal of random testing is to discourage drug use among employees by not telling anyone who or when or where they are to be tested in advance. The DOT has laid out specific guidelines and regulations regarding random drug testing that is followed by all major transportation agencies including FAA, FMCSA, FRA, PHMSA and USCG.