and discriminatory conduct, its treatment of people with behavioral health issues, and the department's current accountability systems. On April 26, Garland announced another investigation into the Louisville Metro Police Department in the aftermath of the killing of Breonna Taylor, examining the execution of search warrants. On August 5, Garland opened another investigation into the Phoenix Police Department over its policies on dealing with the homeless. On December 3, the DOJ opened another investigation into the Mount Vernon Police Department to assess if it engaged in discriminatory policing, involving its use of force, strip and body cavity searches, how it handles evidence, and its systems of accountability. In June 2021, the DOJ, through a memo issued by Deputy Attorney General Lisa Monaco, reversed a Trump-era policy that banned federal officers and agents from using body-worn cameras; the memo also mandated the use of body-worn cameras for federal law enforcement in certain circumstances (including when carrying out planned arrests or executing search warrants). On September 14, 2021, the DOJ announced a civil investigation into prisons in Georgia, focusing on prison violence and sexual abuse of LGBTQ prisoners by prisoners and staff, continuing with an initial investigation launched in 2016. In September, 2021, the DOJ in a memo limited the use of chokeholds and carotid restraints by federal officers during arrests, prohibiting such tactics unless deadly force is authorized (i.e., unless the officer reasonably believes "that the subject of such force poses an imminent danger of death or serious physical injury to the officer or to another person"). The memo also limited the use of unannounced ("no-knock") entries when executing warrants, directing officers to knock-and-announce except "where an agent has reasonable grounds to believe that knocking and announcing the agent’s presence would create an imminent threat of physical violence to the agent and/or another person." On October 13, 2021, the DOJ launched another investigation into five juvenile detention facilities in Texas for systemic physical or sexual abuse of children. School board memo In October 2021, amid a surge of threats against school board members across the country, Garland issued a memorandum addressing an "increase in harassment, intimidation, and threats of violence against school administrators, board members, teachers, and staff"; the memo directed the FBI and US attorneys' offices to set up meetings with federal, state and local law enforcement leaders for establishing tiplines for threat reporting and discussing strategies to address such threats.