Under Washington State Law, how can a police officer issue a ticket if it wasn't personally observed. ?

I was hit from behind, no witnesses other than me and the other driver. I denied changing lanes, yet I got the ticket. I am looking for statutes or case law which give guidance. The only thing the ticket says is the officer had probable cause to believe the offense happened, however, we were both pulled off on the side of the road and waiting for 30 minutes until he arrived. My bumper was hit. Please helpUnder Washington State Law, how can a police officer issue a ticket if it wasn't personally observed. ?
It is called an ';investigation';



Just because you moved your vehicle, does not mean there was no evidence at the scene as to what happened.



You denied changing lanes...........but I'm guessin you did just that or you would not have been cited.........