No. They do not test for alcohol via hair or urine. Only thru blood or breath alcohol. And like another poster mentioned, alcohol is legal. The only way they would test would be a random breath alcohol test that may be required by the US DOT or in a case of reasonable suspicion or as standard policy in some manner of post accident protocol. Long story short, long as you're not drinking on the job or showing up with alcohol in your system, you'll be just fine.