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This may or may not help you, but xanax is a benzo. One of many. Depending on dosage and length of time taken it will stay in the blood from 7-10 days. If it is a casual drug used it may only be detected at tops 5 days. Look on the web under drug detection times or Xanax detection times. Otherwise ask your doctor. They will have proper books to look up. Hope this helps

The effect of being struck on the head with a lead pipe lasts longer than the stike itself.