The Rules prohibit covered employees from performing safety-sensitive functions:
- When a breath test result indicates an alcohol concentration of 0.040 or greater.
- While using alcohol on the job.
- Within 4 hours after using alcohol (8 hours for flight crew members and air traffic controllers).
- If they use alcohol within 8 hours after an accident when their involvement has not been discounted as a contributing factor or before they are tested.
- If they refuse to submit to a required alcohol test.
