About a month ago I smoked a joint with a guy I barely know. It was my first time smoking in years. I took 3 big deep hits. What followed was the worst trip you will ever have. I never tripped at all on weed when I smoked years ago but that night I almost died because I went thru seizures. I ended up in the er because when I got home my gf called the ambulance because I had convulsions and i kept saying im gonna die. I got physical with the ambulance guys so they had to restrain me and sedate me. I dont remember anything until 2 and a half hours later when I woke up in the er. There's a lot more that happened that night but basically it was the worst trip ever. What makes no sense is not only that I tripped that bad on what was weed according to the guy, but that the er urine test came back negative for thc. It was positive for benzos though because of the sedation drug they gave me. Thing is that at the time of the urine test it had been 3 hours since they gave me the sedation drug, but more than 4 hours since i smoked the joint. Also, they said they only gave me a little of the sedation drug but I hit the joint HARD. How can it be that the urine test came back negative after I smoked so much? How long after u smoke weed does it take for thc to show up on a urine test?