Before hiring—the driver must always be tested unless he or she has been in a federally-approved drug testing program in the past 30 days and meets other strict requirements.
After a collision—the driver must be tested in all instances when there has been a death and in some cases when there have been injuries or a towed vehicle.
Randomly—all motor carriers must have random drug testing of 50% of its drivers annually.
Reasonable suspicion—all carriers must drug test drivers it has a reasonable suspicion violate drug regulations.
Return-to-duty—all drivers must receive a return-to-duty drug test.
Follow-up—Follow up tests must meet federal requirements.

Before hiring—the driver must always be tested unless he or she has been in a federally-approved drug testing program in the past 30 days and meets other strict requirements.
After a collision—the driver must be tested in all instances when there has been a death and in some cases when there have been injuries or a towed vehicle.
Randomly—all motor carriers must have random drug testing of 50% of its drivers annually.
Reasonable suspicion—all carriers must drug test drivers it has a reasonable suspicion violate drug regulations.
Return-to-duty—all drivers must receive a return-to-duty drug test.
Follow-up—Follow up tests must meet federal requirements.

When must a truck company give a driver a drug test?