I believe most LSD actually leaves the urine before you even experience any effects, though it can be found up to 96 hours (4 days) later...
I can still smell it in my skin after 20 years. A small area on my left forefinger, no shit. Kind of a sweet flowery smell.
It acts as a catalyst- couple of hours, and it's gone. In any case, it would take mass-chromatography to detect it
Ehhh... IDK i'm not going to down your music or whatever... but most of my friends listen to shit like that and also hardcore metal like unearth underoath lamb of god, i absolutely hate it, but I can understand why they like it. For a lot of people, it helps them release their anger or whatever and pit and fuck each other up for a release... not really a good type of stimulation for tripping lol... Generally, you want to keep a pretty positive, sort of controlled environment when tripping, and music like that is generally pretty negative or 'dark' and all chaotic.
Ah, listen to some Burn the Priest, Prayer for Cleansing, or Circle of Dead Children when you're trippin'... Though for the hard stuff, I usually stick to NIN, Tool, Therapy?, etc...heard some Atrophia Red Sun the other day, the song "Structure of Emptiness" is pretty trippy (for melodic death metal, anyway)... ...this is getting way off-topic. *lol*