Answer:
weed, cocaine, pcp and LSD opiates,boenzos,methodone,crystalmeth,
to the idoit who said..LSD no they don't. they only way you can tell if that person used LSD is if they do a spinal tap on you. which is illegal to do in a lot states in the us
and if you live in a place that isn't illegal they wont spinal tap you because 1)it costs money 2)you will trip off the tap
and the reason it is illegal is because people have died..and also you could possibly be tripping for the rest of your life.
Both people who commented on this are incorrect. THERE IS ABSOLUTELY NO EVIDENCE THAT LSD RETAINS IN YOUR SPINAL FLUID. Also you will not "trip" for the rest of your life if I spinal type is done and you have done LSD before. The half life of LSD in plasma is 5.1 hours.