What type of drugs are tested for? That's a common question, but I will answer another common one first to get it out of the way. Drug testing in not a requirement prior to getting your CDL. It is a requirement before getting hired.
The types drug and alcohol tests required for commercial drivers are:
Trucking companies both large and small are required by the federal government to test for several substances by urine samples.
Source: Alcohol and Drug Rules - FMSCA
If during the screening there is reason to believe one of the drugs is present, it goes through a more intense analysis for confirmation
Alcohol testing can be done with Saliva devices or Breath Testing by employees of the company or contracted services. Alcohol testing is not done generally as part of a roadside inspection.
Under certain conditions a test administered by an officer is accepted but he/she must be trained in using EBT or Evidental Breath Taking devices.
After an accident, you will be required to find a place to get testing done for alcohol.
Drivers who fail the alcohol testing is required to be removed from safety-sensitive duties. They must be seen by specialist in the field and going through recommended rehabilitation or treatment before returning to duty.
More information here at the FMCSA website
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