RE: Wavers?
Well, the way I see it is if you sign some guy off and he T-bones somebody with his airplane, you are likely to be involved in any subsiquent legal action. If you say "I just made him do the minimum AMA manuvers and he was fine" you'd probably be OK, but if you could say that AND "I then made him do X, Y, and Z and observed his flying for several more flights and he was fine.." you're more likely to be out of it having done your due diligence at that point...
Bob