Question: if you have previously failed on drug test, will the new company find that out? some job applications ask you if you have failed drug test in last 10 years. how do these company verify that you have previously faild on drug test?

Answer: A company really cannot find out if you failed a drug test.  The place where you did the drug test can't release the information unless you allow them in writing.  That means you had to sign something saying anyone who requests the info can have it.  Also, if the new company were to cal the old company, the old company can't legally give out that info either.  I think you are pretty safe.
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