if some one really wants to commit suicide,they do it.they wont tell no body.if some one tells some one that they wanna kill them selves or gives hints,they're crying for help.in that case they get took to the mental hospital for evaluation and most likely get kept for 72 hours.they get some counciling and realize they "were" crying for help and didnt realy want to die.they might get some pills and they'll leave the hospital o.k. if they were really fucked in the head,they wont leave in 72 hours.2 people real close to me have been in that situation so i know first hand how it is.............
as far as other mental illness's,my dad is Homicidal Schizophrenic.he's been diagnosed since the early 80's.a really crazy mothafucka.if you got shit like that then they give you meds to take everyday,but he aint ever took his shit so his shit progressed.its killin him.and he's been to the mental hospital,but not for suicidal tendencies.hes diagnosed "Homicidal Schizo" so he'll take someone else out before he'd take his life.and thats some scary shit if you really know what Schizophrenia is..............