My question involves a traffic ticket from the state of: Massachusetts
I was driving 87 on a highway and the speed limit is 65 mph. The police asked me do I know my speed and I said yes. Then he said "it's 87" and went back to his car. On the ticket, there are "POSTED", "LIDAR","ESTIMATED". And under the "SPEEDING", there is something but I can't read it. I'm attaching the ticket.


Here are some other things.
(1)I did not have front license plate at that time because it was lost. I went to RMV to report this several days before I was pulled over, so not having front plate won't be my problem. And I heard lidar should be pointing at license plate, so will it help me?
(2)The police officer did not ask for my registration, but only driver license.
(3)After the police gave me the ticket, he reversely drove on the shoulder and went back to his old hiding place, without blue light nor siren. So can I use this to challenge his training, or his qualification? I had two friends in the car with me so they can prove the police drove like that. Is that enough for evidence?

And is it a good idea to challenge the officer's credibility or training in the hearing?