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Workplace Safety

Reasonable-Suspicion Testing: A Workplace Guide for Employers

Published August 25, 2026

Reasonable-suspicion testing should be based on documented observations and a defined employer process rather than rumor or guesswork.

Reasonable-suspicion testing is one of the most sensitive parts of a workplace testing program. Employers need a process that focuses on observable facts, documentation, employee safety, and the rules or policy that apply.

Use observable information

A decision should not be based only on rumor, personality conflict, or a vague feeling. Supervisors should document specific observations and follow the company’s established procedure.

Know whether DOT rules apply

DOT-regulated reasonable-suspicion testing has specific requirements that can differ from a Non-DOT company policy. Employers with regulated employees should ensure the responsible supervisors receive the training required by the applicable agency.

Document before details are forgotten

Write down the observations, timing, people involved, and steps taken. Good documentation supports consistency and helps the employer explain why the testing decision was made.

Plan transportation and safety

If an employee appears impaired, do not create an additional safety risk by simply telling the person to drive to a collection site. Follow your company’s safety and transportation procedures.

Apply the policy consistently

A written policy and trained supervisors help reduce inconsistent decisions. Employers should also review applicable employment and privacy requirements.

Test Pro LLC can coordinate testing once the employer has made the appropriate testing determination.

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