Whoa! Too many circumstances are given without enough information. If you were injured on the job and were drug tested as a result, and you tested positive, you could be disciplined or dismissed. Questioner will have to supply more info about the "harassment" portion of the question.
If you mean employer, yes they can, but any employer that makes you take a drug test for employment isn't going to hire you if you fail it.
The cough syrups that could cause a drug test to fail require a prescription to purchase.
the police could arrest you
Yup, and they do it for a reason: they've had so many people come in to apply for jobs then fail the drug screen, they need to find a way to keep drug users from applying. Telling the applicants they have to pay for their own drug tests solves this problem: no one wants to pay for a drug test they know they'll fail.
harass you until it gives up
can a fail a drug test if I take clonazepan
Yes
It will make you fail the right drug test. Morphine is an opiate and because it is a common drug; it will make you fail a lot of different drug tests.
No, taking the drug Viagra will not make you fail a drug test.
It depends by the definition of fail. Codeine is somewhat converted to morphine in your liver so if your drug test includes a test for opiates then it will show up as positive. Depending on if you have a prescription or if codeine is controlled in your location it could mean you fail.
Will hydroxyst make you fail a drug test for amphetamines
Fail or Give up