Officers test a headlight by putting a white piece of paper in front of the light. If it emits a blue color, you'll get a ticket.
"Some of those lights - will specifically say - not for highway use - not approved - not DOT approved. Things like that in the small print. But people will buy them anyway because they look cool," said Kennewick Police Sergeant Ken Lattin.
And the fines are stiff. We're told a ticket for a blue headlight costs $124.