I was a passenger with a guy coming back back from Galveston in the wee hours (a long, LONG time ago) and we were stopped on I-45. . . for going too slow.
(No ticket, no search, no sobriety tests. I don't know how many ways I can say lucky)
Had a friend in high school that was a much safer driver while high. I remember riding to a concert with him once. On the way to the show, I twice thought we were going to wreck but the ride back was the exact opposite.