How to interact with a police officer(s)

All the good ole boys from yester year are retiring or long retired.
So what we are left with is a few bald headed thugs suffering from PTSD.
How do you look in a cops eyes when he's wearing dark sunglasses ?
I will give a cop the same respect they give me.
I always treat them with respect, even the young thugs, until it's time not to.