Can a company start drug testing employees after they’ve been hired?

Question by Dave Grohl: Can a company start drug testing employees after they’ve been hired?
I’ve been at the company for months and never signed anything about drug testing nor was I told it would be a job requirement. We’ve recently hired a new employee and she had to take a test due to a new policy. I want to know if a company can decide to drug test employees after they’ve been hired without notifying them of this practice during the application process.

Please refrain from posting comments like “drugs are for idiots, losers, etc.” I am a college graduate and a good employee who would like to keep his job and am not looking for moral guidance.

Best answer:

Answer by know-it-all
Companies can do random drug tests if they want – but usually they do not go back and test employees unless they have reason to suspect something or you are using company vehicles or heavy equipment that would endanger others.

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