Quote Originally Posted by notrightquite
Seriously, the danger here is his friend driving ... and if he's EVER planning on having kids, he shouldn't do acid until he's already had them. The shit never does leave your system.
That's an urban myth. I'm not sure about how long it takes but something like 80 % of it is excreted within 2 hours or something like that. http://www.erowid.org/chemicals/lsd/lsd_myth1.shtml