| http://www.w3.org/ns/prov#value | - Where impairment is suspected, a railroad, in addition, may require urine tests, but only if two supervisors make the appropriate determination, 219.301(c)(2)(i), and, where the supervisors suspect impairment due to a substance other than alcohol, at least one of those supervisors must have received specialized training in detecting the signs of drug intoxication, 219.301(c)(2)(ii).
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