EFFECT:  Modifies the definition of "necessary" to mean that, under the totality of the circumstances, the type and amount of physical force or deadly force used is a reasonable and proportional response to effect the legal purpose intended or to protect against the threat posed to the officer or others (rather than providing that the term means, with respect to physical force, that under the totality of the circumstances, the type and amount of physical force is reasonable to effect the legal purpose intended, and rather than providing that the term means, with respect to deadly force, that under the totality of the circumstances, the use of deadly force is a reasonable and proportional response to the threat posed to the officer and others). Retains the provision in the underlying bill providing that "necessary" also means that a reasonably effective alternative to the use of physical force or deadly force does not appear to exist.