Can my dad put a mental hygiene warrant on my sister?

Legal issue . Each state has its own laws relating to mental disorder and civil commitment procedures. For example, in kings county (brooklyn), the process is described at http://newyorkcity.Ny.Networkofcare.Org/mh/services/agency.Aspx?Pid=kingscountybrooklynmentalhygienewarrantprocedure_754_2_0. The procedure allows family members to assist an at-risk loved one with severe psychiatric symptoms.