recently my son was in a car accident where he sustained a concussion. the officer at the scene accused him of being either high and/or drunk. my son has no recollection of the arrest, etc. the question i have is the night before the accident my son had back pain at work (the job requires physical work and long periods of time standing) and asked co-workers for tylenol . since nobody had tylenol one co-worker gave my son 1 vicodin tablet. my worry is if my son was given a urine test , 24 hrs after taking the vicodin, it will show up. whether it shows up or not what are the chances of this one tablet affecting his ability to drive 24 hrs later? thank you in advance.