Five major groups of drugs are screened for in a DOT 49 CFR Part 40 random urine drug test. The DOT testing for drugs is for the presence of illegal substances, whereas for alcohol, it is for impairing levels of legal substances. A complete description of drug testing procedures is beyond the scope of this page.
Drug testing is by urine sample.
Both the observer and the testee will initial sealed containers of the urine attesting to the identifying information and the specimen. Several copies of paperwork will also be signed by each individual and one copy of the form will be given to the testee. A chain of custody must be maintained for valid testing results to be reported. They must demonstrate technical and administrative ability to process specimens in according to federal regulations. Testing is basically a three step process.