Sens. Patty Murray, D-Wash., and Ron Wyden, D-Ore., sent letters Thursday to the heads of four of the largest companies and organizations operating residential treatment facilities across the country — Vivant Behavioral Healthcare, Universal Health Services, Acadia Healthcare and Devereux Advanced Behavioral Health — requesting information about each location and program they operate.

The senators asked for documentation on policies for restraining children or placing them in seclusion, the training provided to employees and the number of maltreatment and abuse incidents over the past five years. They also asked for details on contracts, funding sources, complaints and inspections, how the companies spend their money, and how the companies ensure that children in their programs get a proper education.