How is an attorney general or district attorney responsible for knowing about a covert program in one of the prisons? It's not like they receive monthly report

How is an attorney general or district attorney responsible for knowing about a covert program in one of the prisons? It's not like they receive monthly reports about all the illegal programs that other departments are conducting. If you're going to rake anyone over the coals for this, go after the Secretaries of California's Department of Correction and Rehabilitation. They were in charge of the department and accountability ends at the top.