Noon sat out his first year after high school (to "mature" as i recall) and then started at Georgia. Don't believe he was ever at UCLA.
I don't recall (not that that might mean much these days!) any rumors about Venegas ever booting anyone because he "thought he was doping." Indeed, in this day and age, if somebody's on scholarship, don't you have to have a pretty good reason--beyond "thought"--before you can axe somebody?
You may be thinking of Kamy Keshmiri, who started at UCLA but there was a stormy relationship regarding his father and who was coaching him, so he ended up at Nevada.... and then a few years later got popped.