From Britney's Wikipedia:
January 2008, Spears refused to relinquish custody of her sons to Federline's representatives. She was hospitalized at Cedars-Sinai Medical Centerafter police that had arrived at her house noted she appeared to be under the influence of an unidentified substance. The following day, Spears's visitation rights were suspended at an emergency court hearing, and Federline was given sole physical and legal custody of their sons. She was committed to the psychiatric ward of Ronald Reagan UCLA Medical Center and put on 5150 involuntary psychiatric hold under California state law. The court placed her under a conservatorship led by her father, Jamie Spears, and attorney Andrew Wallet, giving them complete control of her assets.