I've dealt with this a couple times with a friend in St. Paul.
Local law enforcement will bring someone into a facility if it is believed they are a threat to themselves or others. Then there is a mandatory 72 hour hold for evaluation. This is mostly for mental health.
My understanding is that if someone is not making any threats about suicide or harming anyone else, there's not much to do. If someone is simply drunk or high then detox is about it.
Edit: the simplest thing may be to call your local law-enforcement non-emergency line and talk to them. They will know when someone can and cannot be confined.