A testing program can appear to be running smoothly until an audit reveals a missing custody and control form, an unverified random selection, or a supervisor record that cannot be located. Knowing how to audit testing records gives employers a practical way to find those issues before they become an inspection finding, a post-accident concern, or a disruption to operations.

For DOT-regulated employers, recordkeeping is not an administrative afterthought. It is evidence that your drug and alcohol testing program was administered correctly. For non-DOT workplace programs, complete records also support consistent policy enforcement, defensible decisions, and employee privacy. The process should be structured, repeatable, and aligned with the program your workforce is actually operating.

Start With the Program Requirements

Before reviewing individual files, confirm which rules apply to the employees in scope. A DOT program is governed by 49 CFR Part 40 along with the requirements of the applicable DOT agency, such as FMCSA, FAA, FTA, FRA, PHMSA, or USCG. Record categories, testing rates, reporting obligations, and retention periods can vary by agency and by the type of record.

Do not combine DOT and non-DOT records without clear separation. A Canadian employer may operate a workplace testing program based on its own policy, while a U.S. transportation operation may have DOT-covered drivers subject to federal requirements. The collection process, documentation, testing reasons, and retention expectations may differ. Clear labels and separate reporting prevent one program from being mistaken for another.

Create a written audit scope. Identify the business unit, covered employee group, audit period, testing categories, and records being reviewed. For example, a fleet audit may cover all DOT drug and alcohol tests completed during the prior calendar year, while also reviewing random testing selections, supervisor training, and Clearinghouse-related processes where FMCSA rules apply.

Build a Testing Records Audit Checklist

A reliable audit does not depend on memory. Use a checklist that follows the path of each test from selection or triggering event through final reporting and record storage. The exact checklist will depend on your program, but it should cover these core areas:

  • Employee eligibility and current roster information for safety-sensitive positions.
  • Random selection records, including selection dates, methodology, employee lists, and proof that selected employees were tested promptly.
  • Test event documentation for pre-employment, random, post-accident, reasonable suspicion, return-to-duty, follow-up, and other authorized test reasons.
  • Collection, laboratory, medical review officer, substance abuse professional, and result documentation, as applicable.
  • Training, policy acknowledgment, reporting, and record retention documentation.

The goal is not simply to confirm that paperwork exists. You are checking whether the records tell a complete, consistent story. A random test record, for instance, should show that the employee was in the eligible pool, selected through an appropriate process, sent for testing within the required timeframe, and recorded correctly in the final program reports.

Verify the Employee Roster and Testing Pool

Start with the population that should have been subject to testing. Compare your active safety-sensitive employee roster against the roster used for random selections. Look for employees who were added late, remained in the pool after leaving a covered role, or were excluded without a documented reason.

This comparison often identifies the most significant program-level problem: the random pool does not match the actual covered workforce. An incomplete pool can affect random testing rates and create an unfair selection process. A pool that includes ineligible employees can also produce unnecessary testing and inaccurate reports.

Review changes during the audit period, not just the current roster. Hiring dates, transfers, leaves of absence, terminations, and changes in job duties may affect whether a worker belonged in the pool at a particular time. The correct answer depends on the employee’s status at the time of selection.

Trace a Sample of Tests From Start to Finish

Select a meaningful sample from each testing category. For a smaller program, reviewing every test may be practical. For larger employers, use a representative sample across locations, dates, supervisors, and test reasons. Include unusual events, such as post-accident tests, refusals, canceled tests, and return-to-duty cases, because these are more likely to involve time-sensitive decisions and extra documentation.

For each selected record, trace the sequence. Confirm that the test reason was authorized, the documentation is complete, the collection information matches the employee and date, and the reported outcome was handled correctly. Where an employee had a verified positive result, refusal, or other violation, verify that the employer’s follow-up actions were documented and consistent with applicable requirements.

Pay close attention to dates and times. A form can be complete but still reveal a timing issue. Post-accident and reasonable suspicion testing require prompt action. Random testing should occur after selection and within the period required by the governing rules. Gaps between selection, notification, collection, and result reporting deserve an explanation supported by records.

Check Random Testing Administration Carefully

Random testing is a frequent audit focus because it must be genuinely unpredictable and conducted at the required annual rate. Review the selection reports to ensure the method is scientifically valid and that employees do not have advance notice of the selection cycle.

Then compare the number of completed random tests against the required rate for the audit period. Do not assume that a quarterly report tells the full story. An employee selected at the end of one period but tested in the next may need careful tracking. Likewise, a missed test or an employee who was unavailable should be documented, resolved appropriately, and reflected accurately in program records.

If you use a consortium or third-party administrator, retain the reports that demonstrate your participation and testing activity. Outsourcing administration can reduce workload, but the employer remains responsible for understanding its records and responding to an inspection.

Review Record Security and Access Controls

Testing records contain sensitive personal and medical information. An audit should examine not only completeness, but also who can access the records and how they are stored. Paper files should be secured and separated from general personnel records. Electronic files should have controlled access, clear user permissions, and a dependable backup process.

Check whether staff members can quickly retrieve records by employee, date, testing reason, and program. Records that technically exist but cannot be produced when requested create an operational problem. A centralized reporting system can make retrieval faster, particularly for employers managing multiple terminals, collection sites, or DOT agencies.

Also review disclosures. Results and related records should only be shared with authorized parties and handled according to applicable confidentiality requirements. This matters in DOT programs and in employer-driven workplace programs alike.

Document Findings and Correct the Process

Record every finding in a simple audit log: the requirement reviewed, the record examined, the issue found, the risk level, the owner, and the correction date. Separate isolated filing errors from recurring process failures. A single missing document may be resolved by retrieving it from a service provider. Repeated missing documents may indicate that supervisors, administrators, or vendors need a better workflow.

Corrections should address the cause, not just the file. If random selection records are difficult to reconcile, improve the roster update process. If post-accident documentation is inconsistent, provide refresher training and make after-hours instructions available to supervisors. If records are scattered among locations, establish one controlled repository and assign responsibility for monthly checks.

For complex DOT programs, an external review can add value by bringing a fresh perspective to testing pools, documentation, reporting, and agency-specific requirements. WOOTS supports employers with DOT program management, testing coordination, customized reporting, and responsive access when testing or documentation questions require prompt attention.

Schedule testing record audits at least annually, and conduct smaller checks throughout the year. The most useful audit is not the one completed just before an inspection. It is the one that gives your team enough time to correct a gap, reinforce the process, and keep safety-sensitive work moving with confidence.