This is just language the first draft of a proposed bill. It isn't the law yet and may die or change, but this is language from an introduced bill in Colorado:
"Peace officers shall avoid the use of physical force when possible. A law enforcement officer shall not use physical force upon another person unless the officer has exhausted all reasonable de-escalation tactics and techniques and, based on the totality of the circumstances, such force is proportionate and necessary to effect an arrest, prevent an escape, or prevent an imminent threat of harm to the peace officer or another person.
A peace officer shall use only a degree of force consistent with the minimization of injury to a person subject to the use of force.
A peace officer shall not use deadly physical force upon another person unless it is used as a last resort."
I think Glock and Sig may start losing out police contracts to these guys:
Don't laugh at Colorado too hard; you may be next!