I think that's a very subjective question, what's legit?  Some say those with physical ailments (that's why I'm looking to CTB, because the condition I used pain medicine to control, I now can't get pain medicine for because of the addicts.  The only relief I have left is CTB.)  But who's to say that someone's mental anguish isn't just as excruciating?  Even if it's not an actual condition.  Maybe they're just tired of living.  I don't think it's really fair to look at anyone through this scope.  Anyone who CTB obviously had a reason that was valid to them, and that's the only one that matters.