| http://www.w3.org/ns/prov#value | - ??199.209 Other requirements imposed by operators.(a) Except as expressly provided in this subpart, nothing in this subpart shall be construed to affect the authority of operators, or the rights of employees, with respect to the use or possession of alcohol, including authority and rights with respect to alcohol testing and rehabilitation.(b) Operators may, but are not required to, conduct pre-emp
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