I have some sympathy for LEOs here, as they have to deal with a lot of dangerous basket cases. That is why I am in pursuit of etiquette, with the hope of achieving the following:
1) “Hey, I’m a good guy, not a threat, or the threat you are currently looking for.”
2) “I am armed, but not hostile, so no big deal. Do not add me or my gun to your stress level.”
3) (for example) “I need to secure my gun in my lock box, which requires I unholster it, and hold it in my hand while checking it for safety. I do not want to upset you while doing this. Also, I intend to do this in a safe manner, to avoid the chance of an accidental discharge.”
There are lots of hypotheticals, here, but etiquette rules only work if everybody knows them.