Some pilots, truck drivers, rail operators, and bus drivers are flunking their drug tests, according to a new study.

A newly released survey from Quest Diagnostics of federally mandated “safety-sensitive workers,” who must receive pre-employment as well as random drug and alcohol testing, found a 33% jump in testing positive for cocaine during 2011.

The data, collected from 1.6 million drug tests done last year, also show a nearly 26% spike in testing positive for amphetamines.

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