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I had a customer call the pharmacy today with a question I haven't heard before and wasn't sure how to answer. She said she was just given a job offer, and that she would have to take a drug test prior to starting. She said her doctor gave her a prescription for 30 tablets of Xanax a year or two ago, but she only very occasionally takes half a tablet and still has 25 tablets left. She asked me if there was a time limit that a prescription is valid for in the event that she had any in her system at the time of the drug test. I initially said as long as she had a valid script for it, it was fine. However, then I started to think that couldn't anyone who ever had a prescription for a particular controlled substance just say that their doctor wrote a script for it years ago and that they still had some left? Just trying to figure out if there is a time limit. I told her I'd let her know if I could find the answer. Anyone know? Thanks!