REALteach4u is 100% correct. You
must understand that a absolute defense
is not a "will not get arrested" card, it is a "stay out of jail" card. Only if you are found by LE to have been justified. If they do not determine via the evidence that you were justified then your fate is left to a jury. LE determines, via the evidence, whether or not you need to remain in custody. The cops are pretty good about figuring our quick like a bunny whether or not you were justified. Then they will "say" something (present the findings of their investigation) to the prosecutor and that person usually will not pursue charges.
"Shall/does not apply" is not the same as a absolute defense. Shall/does not apply means that you can not be prosecuted, let alone be arrested. Then the arrest, if it occurs, for a legal activity will be found to have been conducted in error. CCWing on your endorsement, if required in those jurisdictions, becomes a sticky issue for the arresting officer who just arrested you because he thought he knew the law.
563.026.2.......Whenever evidence relating to the defense of justification under this section is offered, the court shall rule as a matter of law whether the claimed facts and circumstances would,
if established, constitute a justification.
3. The defense of justification under this section is an
affirmative defense.
http://www.moga.mo.gov/statutes/C500-599/5630000026.HTM
What the above means is that you, or your attorney, must affirm your justification under the statute and then you must meet the standard postulated in my opening statement.