Exclusive: “The way we treat mentally ill in this country is insane.” That’s how one psychiatrist starkly describes the state of affairs in America’s broken mental health system, which is put under the microscope in Bedlam, a documentary directed by psychiatrist-filmmaker Kenneth Rosenberg. The pic is having its world premiere later this month at the Sundance Film Festival.

Check out the trailer that offers the first look at the docu, which bows in Park City in the fest’s U.S. Documentary Competition section. It will also air likely later this year as part of PBS’ Independent Lens series.

Rosenberg, fueled by his own sister’s battles with mental illness, captures footage shot over a five-year period at a Los Angeles County psych ER, revealing the sometimes horrific reality of a deinstitutionalized system in which emergency rooms often provide the only refuge for the severely mentally ill who need care.