Hi, in my novel, there is a guy who is addicted to drugs. he takes drugs, passes out, and wakes up in the middle of the night in the janitor's closet (he is the janitor). He then, half in a stupor, stumbles into a room where a rape is taking place and the rapist quickly kills both him and the girl he was raping. I don't know much about drugs, but basically I need a drug which allows: - the janitor to take it, pass out, and wake up four hours later in a daze but able to walk (he took a bigger hit than usual because he was depressed about his personal life - hence the passing out) - when the janitor is murdered, and the crime scene found the next day, I need a drug so that (without blood tests) it's obvious the janitor had a hit of drugs before he was killed. what visible signs would there be that he had been using drugs before his murder? things that would stand out as odd or unusual. if any drugs come to mind, I'd appreciate if you could tell me and explain the visible signs caused by use of the drug.