20=perfection. not to dark, and looks great

 

In Alabama, legal tint limit is 32%. I know some states don't care and don't have a tint law and yeah, I have illegal tint on my windows, I just roll them down way before the officer gets there, no problem. I have never had a problem with officers and tint. I'd find out what your states legal limit is and drop a few points below that. Just make sure to roll your windows and more than likely, the officer won't mess with you about it. They do have plenty of devices that can check your tint so again, be careful.