Where I live every can do a 48 hour hold before a judge comes by and says let em go. The one time I got pulled in for suicidal ideation I just said "listen, I don't currently have a plan and I've been sucidal for months. You're not going to fix whats wrong with me or reduce my base risk by holding me in 48 hours and I will be AMA with a judge at the end of those 48 hours. Just let me go." And so they did.