It bears repeating, ignore the Legal Chest Thumpers
How to Give a Statement in the Case of a Shooting
Please read the initial article and all related articled linked plus all the videos.
Once the police officer made their minds, it is 10 times harder to turn the boat around towards the truth because simply they may not believe you.
If you carry, I very strongly recommend attending Massad Ayoob's MAG 20. Period.
Ditto on MAG 20. Several years ago I flew to Iowa and had my son there and a son from Nevada join me in attending the course. VERY much worthwhile.