I went looking for Lamar Gant stuff in youtube. and about 1:16 in the video, Lamar says, he has scoliosis, and he says that deadlifting is very good for the back, not dangerous at all.
This video looks like a pretty new interview. Lamar seems like a pretty nice guy.
I think I just became a fan, and can look at him for motivation and inspiration. This guy is helping me get motivated into fitness even more.