Am I Subject To Drug Testing Requirements?
You are subject to the drug testing requirements if you operate a motor vehicle or combination of motor vehicles used in commerce to transport passengers or property if the vehicle -
Has a gross combination weight rating of 26,001 or more pounds inclusive of a towed unit with a gross vehicle weight rating of more than 10,000 pounds; or
Has a gross vehicle weight rating of 26,001 or more pounds; or
Is designed to transport 16 or more passengers, including the driver; or
Is of any size and is used in the transportation of materials found to be hazardous for the purposes of the Hazardous Materials Transportation Act (49 U.S.C. 5103(b)) and which require the motor vehicle to be placarded under the Hazardous Materials Regulations (49 CFR part 172, subpart F).
For everything you may want to know and more, check the following page for a complete set of rules and regulations.