A passenger vehicle has the same mirrors as a passenger vehicle towing a large trailer that blocks rearward views. The universally applicable requirement is to

A passenger vehicle has the same mirrors as a passenger vehicle towing a large trailer that blocks rearward views. The universally applicable requirement is to not move in a direction without checking that you can. "Blind spot" is mostly a euphemism for "spot I was too lazy to check". Hassling someone over something hanging from a rear view mirror seems like the epitome of arbitrary nanny state nonsense that undermines respect for law enforcement in general. Similar to unreasonably low speed limits that criminalize most every driver, and let police think that doing their job means sitting on the side of the road playing Candy Crush until the radar gun makes a noise, rather than doing the work of catching actual road hazards like semi trucks that block the left lane trying to pass while going uphill.