In California, we have the infamous 5150, that I got once. If a police officer or a counselor feels you are a danger to yourself or others, you can be locked up for 72 hours and you have no say in the matter. At that point, you can be held longer, up to 14 days on a 5250, but you have to be ruled a danger by a judge at a hearing. Honestly, I've never completely forgiven my wife for having me dragged out of bed in the middle of the night by cops with flashlights and sent to a hospital and then a psych ward against my will, but I do believe she was doing what she thought was best at the time.