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There are four classes of transportation workers who must be drug tested: aviation workers, ground transportation workers, water transport workers and mass transit workers. If you ride a bus you'll see two guys putting the bags under the bus, and both of them are subject to drug testing. All these people are subject to DOT drug testing.

Any other drug test is a non-DOT drug test.

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14y ago
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Q: What is a non-dot drug test?
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