Learn how dot testing chain of custody works, why errors matter, and what employers can do to protect compliance and test result integrity.

Learn clearinghouse recordkeeping requirements, what employers must retain, for how long, and how to stay audit-ready under DOT rules.

Point of care drug testing workplace programs offer faster results, but employers need clear policies, trained staff, and compliant follow-up steps.

Learn how a PHMSA drug testing program works, who it covers, key testing rules, and where employers often make compliance mistakes.