this is how we find out things, not to mention a person doesn't just snap (those who do are generally a crime of passion) But, if a person is Baker Acted (that which Hellstromm explained) that person should not be allowed to go off their medicine, and/or if they do, they should be put right back in, until they become compliant. We don't have to do the whole witch hunt thing...I am not saying that, but there are signs and symptoms people will see prior, most people just ignore them.In the U.S., if a person demonstrates to be a Danger to Self, a Danger to Others, or is Incapable of Caring for Self, they can be placed under a 72 hour hold (against their will) for psychiatric evaluation. If, in that time, a psychiatrist may deem it necessary to stabilize the person before allowing him/her to be released, which results in extensions to the psychiatric hold.
In other words, not by choice. A person can enter any psychiatric facility voluntarily, but a paychiatrist will have to see them before they are released again. And, if the psychiatrist determines the person falls into one of the three stipulated states indicated in the first paragraph, the psychiatrist is legally obligated to impose a 72 hour hold on the person, effectively changing a voluntary admission into a legally bound treatment.