The use of force is an integral part of a law enforcement officer's job, particularly when arresting criminal suspects. No one disputes that police should be permitted to protect themselves and others from threats to safety, but what is often disputed is an officer's assessment of a threat and the level of force selected to counter it. As a general principle, the level of force used should be tailored to the nature of the threat that prompted its use. As a constitutional principle, (Tennessee v. Garner 1985), the level of force must be reasonable -- not the most minimal level possible, just reasonable. As a common law principle, there should be some warning beforehand by the police before force is used; however, since Amato v. U.S. 1982, this warning is only required before deadly force.