Dash cams are legal in all 50 US states. Some states have windshield obstruction laws that require mounting behind the rearview mirror. Check your state's specific placement rules.

Should I hardwire my dash cam?

Hardwiring enables parking mode without draining your car battery. It is the recommended setup for full protection but a cigarette lighter plug-in works fine for driving-only recording.

Best Dash Cams to Protect Yourself on the