Children's Services, Dept. of - As enacted, requires a child placed in the custody of the department to remain in custody so long as necessary to complete treatment or services, which must be evidence-based and provided by a qualified provider; makes other changes to child custody law; creates a juvenile commitment review task force to examine system issues and service gaps for certain children committed to the custody of the department. - Amends TCA Title 37, Chapter 1, Part 1.