The Dallas City Council last week approved mandatory drug tests for city employees but did not extend the policy to itself. The council instead approved a measure asking members to take voluntary drug tests.

The drug policy for city employees takes effect Oct. 1 and stipulates that all people applying for ``safety sensitive'' positions - such as driver, mechanic, and maintenance worker - must take drug and alcohol tests to be hired. About two-thirds of city jobs are affected.

On Tuesday, the US Supreme Court upheld drug testing for railway workers involved in accidents, and, by a narrower margin, for Customs Service workers seeking assignments as drug enforcement agents or in jobs requiring them to carry firearms.

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