In Florida they have something called the Baker Act, if a person is deemed by a family member, teacher ,clergy, friend etc. To pose a threat to themselves or others they can be involuntarily committed for 72 hours while Mental health proffessionals from several fields attempt to assess the risk and if it is actual or simply being faked for whatever reason.

I know there are a few other states that have similar Acts, it is time we have that availability in all states.

And before anyone goes off on a phone call can lock up your annoying little brother etc. You do have to provide clear and cincise statements, that would make a reasonable person fear for their health and/or safety or that of the person in question.