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Employers having “actual knowledge” that a driver has an alcohol concentration above the limit, is using alcohol or a controlled substance, has used alcohol within the past four hours, or has tested positive or has adulterated or substituted a test specimen for controlled substances, must not allow the driver to perform safety-sensitive functions.
“Actual knowledge” means actual knowledge by an employer that a driver has used alcohol or controlled substances based on:
Employers having “actual knowledge” that a driver has an alcohol concentration above the limit, is using alcohol or a controlled substance, has used alcohol within the past four hours, or has tested positive or has adulterated or substituted a test specimen for controlled substances, must not allow the driver to perform safety-sensitive functions.
“Actual knowledge” means actual knowledge by an employer that a driver has used alcohol or controlled substances based on: