DOT Random Drug Testing Rates for 2026

How DOT Random Testing Rates Work

Each DOT agency sets a minimum random drug and alcohol testing rate for covered employees. These rates are expressed as a percentage of the average number of covered employees in your random testing pool over the calendar year.

Rates can change year to year based on the industry's positive test rate. When positive rates are low, agencies may reduce minimum rates. When positive rates rise, they increase them.

2026 Minimum Random Testing Rates

FMCSA (CDL Truck and Bus Drivers)

• Drugs: 50% of average pool size
• Alcohol: 10% of average pool size

The FMCSA has maintained the 50% drug rate for several years due to elevated positive rates, driven largely by marijuana positives following state legalization.

FAA (Aviation)

• Drugs: 25% of average pool size
• Alcohol: 10% of average pool size

FRA (Railroad)

• Drugs: 25% of average pool size
• Alcohol: 10% of average pool size

FTA (Mass Transit)

• Drugs: 25% of average pool size
• Alcohol: 10% of average pool size

PHMSA (Pipeline)

• Drugs: 25% of average pool size
• Alcohol: Not required by PHMSA regulations

Note: Confirm current rates with your applicable agency or C/TPA, as rates are reviewed annually.

How to Calculate Your Testing Obligation

Step 1: Determine your average pool size for the year.

Add the number of covered employees in your pool at the beginning of each quarter and divide by the number of quarters (4).

Example:

• January 1: 40 drivers
• April 1: 45 drivers
• July 1: 50 drivers
• October 1: 48 drivers
• Average: (40+45+50+48) ÷ 4 = 45.75 → round to 46

Step 2: Multiply the average pool size by the required rate.

For FMCSA drugs: 46 × 50% = 23 drug tests required For FMCSA alcohol: 46 × 10% = 4.6 → round up to 5 alcohol tests required

Important Notes

You must meet the minimum rate each calendar year. If you fall short, you are out of compliance.

The rate is a minimum, not a maximum. You can always test more frequently.

Each selection must be made randomly. You cannot save up selections to meet your quota at year end — selections should be spread throughout the year.

Consortium pools: If you participate in a C/TPA-managed consortium, the C/TPA calculates and manages the rates for the combined pool.

Recordkeeping

Maintain annual records showing:

• Number of covered employees in the pool each quarter
• Total random drug and alcohol tests conducted
• Test results (positive, negative, refused)

DOT auditors will review these records during compliance audits.

At Do It Right Screening, we manage random testing programs and ensure your rates remain compliant throughout the year. Contact us to set up or audit your current random program.