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54 <br />and is subject to the commercial driver's license (CDL) requirements of part 383. <br /> <br />What is a Safety-Sensitive Function? <br />A safety-sensitive function is defined as including any of the following circumstances and/or activities: <br /> <br />* At a carrier or shipper plant, terminal or facility, or other property, or on any public property, <br />waiting to be dispatched, unless the driver is relieved from duty by the employer; <br />* Inspecting service brakes, including trailer brake connections, parking (hand) brakes, steering <br />mechanism, lighting devices and reflectors, tires, horn, windshield wipers, rear vision mirrors, <br />coupling devices, fire extinguisher, spare fuses, or warning devices for stopped vehicles; <br />* Inspecting, servicing, or conditioning any (CMV) in operation; <br />* At the driving controls of a CMV in operation; <br />* While in or upon any CMV, except when resting in a sleeper berth; <br />* Supervising or assisting in loading or unloading a vehicle; <br />* Attending a vehicle being loaded or unloaded; <br />* While in readiness to operate the vehicle; <br />* When giving or receiving receipts for shipments loaded or unloaded; <br />* performing the driver requirements of sections 392.40 and 392.41 of part 392, Driving Motor <br />Vehicles, relating to accidents; <br />* Repairing, obtaining assistance, or remaining in attendance upon a disabled vehicle. <br /> <br />What Are the Alcohol and Drug Prohibitions? <br />The DOT refers to the restrictions for the use of both alcohol and controlled substances as prohibitions. <br /> Alcohol Prohibitions are tied to the performance of safety-sensitive functions in the following ways: <br /> <br />1. A driver may not report for duty or stay on duty: <br />a. with a blood alcohol concentration of 0.04 or greater; <br />b. if in possession of alcohol (unless it is being transported as cargo); <br />NOTE: this includes any product (medication, food, or other product) containing <br />alcohol, regardless of the alcohol content. <br />c. if using alcohol; <br />d. within four hours of using alcohol. <br /> <br />2. A driver who has an accident may not use alcohol until post-accident testing is done or for a <br />period of eight hours, whichever comes first. <br />3. Drivers cannot refuse to submit to alcohol testing. <br />4. Employers who know about any of the above acts cannot permit the driver to perform a safety- <br />sensitive function. <br /> <br />The Federal Highway Administration bans the use of controlled substances by drivers. <br /> <br />Drug Prohibitions: <br />1. Drivers may not report for duty or stay on safety-sensitive duty while using any controlled <br />substance. There may be an exception to this ruling if a physician has prescribed a substance <br />and has advised you that is does not interfere with your ability to operate a vehicle in a safe <br />manner. <br />2. Drivers may not report for duty or stay on duty if they have tested positive for a controlled