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In the wake of a number of recent tragedies, law enforcement around the nation is reexamining the way it engages with individuals who come into contact with the criminal justice system, i am directing the Department's law enforcement components to revise their policies to explicitly prohibit the use of chokeholds and the carotid restraint technique unless deadly force is authorized, and to limit the circumstances in which agents may seek to enter a dwelling pursuant to a warrant without complying with the' knock and announce' rule.