First of all, I think you've gone into crisis-management mode. I don't know what you do for work, but I bet you're great at it. Use the fact that you're calm, cool and collected to your benefit, because at some point you'll come out of this almost shock-like state and you'll start "feeling" it. You absolutely did the right thing, although I'm pretty sure you know that. By taking him to the hospital instead of waiting for a state trooper in the morning (wtf), you established that your husband needs care because he is not thinking/acting rationally.

You need to hire a lawyer for your husband immediately.

Let's recap: you immediately notified his superior, took him to the police station, and when that failed, the hospital. If I were you, I'd sit down and write out a timeline of exactly what happened to the best of your recollection. EX: 7:04pm husband called me and stated "blahblahblah". Time is of the essence hiring a lawyer, as your supervisors may want to sit down with you and discuss it ASAP.

If possible, you should share this with your lawyer first before your supervisor. However, you need to let your supervisors know what happened from your point of view before this escalates any further for you.

Hopefully due to your quick action and your husband's mental state there will be no criminal charges pursued. However, he will most likely be black-listed from ever working with a vulnerable population again.

Please post an update to this... I would be really interested to hear what happens.