I went to college at the Univ. of tx at Elpaso, utep,,,,and while there taught a fellow student to shoot a 22 pistol, he asked a lot of questions concerning selfdefense and a 22 and the best location for terminal results, I didnt catch the signs that were there, a month or so later he cleaned out his dorm room and drove to the other side of town and took his life with that 22. He was 21 years old and had one semester left to complete his accounting degree-----the only reason I can see that there were subtle signs is because of the suicide, most likely I would not have been able to stop him anyway, and having known more than myshare of this behavoir from people I dont believe you can necessarily stop or be aware of there intents......y0u never know what causes them to switch from rational to irrational behavioir or when it will happen........fubsy.