← All Articles
Employer Guides

How Random Drug Testing Programs Work for Employers

Published August 25, 2026

Learn the basic parts of a workplace random testing program, including pool management, selections, notifications, testing, and documentation.

A random testing program is more than choosing an employee’s name from a list. A dependable program needs a defined pool, a defensible selection process, timely testing, and good records.

Define who belongs in the pool

The first step is identifying which employees are included. DOT-regulated random programs must follow the rules of the applicable transportation agency. Non-DOT random programs should follow the employer’s written policy and applicable law.

Keep the roster current

Employees who start, leave, or change job duties may affect pool membership. Employers should update the roster promptly so selections are made from the correct population.

Use a genuinely random selection process

Selections should be generated through a method that gives covered employees the appropriate chance of selection. For regulated programs, follow the applicable federal requirements rather than creating an informal office process.

Notify employees appropriately

Once a selected employee is notified, employers should follow the required or policy-based timeline for proceeding to the collection site. Advance notice can undermine the purpose of random testing.

Maintain documentation

Keep records showing pool membership, selection periods, selected employees, test requests, completion status, and results according to the requirements that apply to your program.

Test Pro LLC supports employer random testing workflows and DOT consortium participation. Employers can use the Test Pro portal to help organize drivers, testing activity, and compliance records.

Need Workplace Testing?

Test Pro LLC provides DOT and Non-DOT testing for employers and individuals.