AFAIK, most people who are at risk of suicide do not have someone in their lives who "can just ask them directly", that's a key factor in why they're suicidal i

AFAIK, most people who are at risk of suicide do not have someone in their lives who "can just ask them directly", that's a key factor in why they're suicidal in the first place. So you'd specifically want a means of detection for people who no-one is in a position to directly ask.