Children's Services, Dept. of - As introduced, removes the requirement that a delinquent or unruly child committed to the custody of the department for an indefinite time remain in custody for no longer than six months in absence of certain circumstances; requires a delinquent or unruly child committed to the custody of the department for an indefinite time to remain in the department's custody until discharge or other placement is warranted by the child's response to evidence-based services and programs or so long as necessary to receive evidence-based treatment or services provided by a qualified provider. - Amends TCA Title 37.