ok, i'll bite.
if the officer wrote "p42" in the speed block of the ticket, i believe he wrote the wrong code if he either paced or approximated your speed. "p" is for pursuit, according to the codes on the front of the ticket book. "r" is for radar, "a" is for approximation. Does this mean the DA will dismiss it? I don't know, it's up to the DA. the onus is on the state to prove the charges.
second, i won't pretend that all officers are experienced, fair, good officers. i don't think anybody i've ever given a ticket to was happy about it, and i think most people have what they perceive as a bad experience with the police. i do think that what a lot of people fail to realize is that we never know what will happen on a traffic stop, just like a domestic, or a warrant call, or a robbery, etc...i've been riding down the road with nothing going on and the next thing i know i'm face to face with a drug dealer with a shotgun in the street who was just in a shootout. for that reason the officers may do things that you don't understand, but they should all be within the framework of the law and their departmental guidelines.
lastly, i don't really expect to change peoples minds with this post, and i really don't want to be flamed...but, i have two pieces of advice for folks... if you've had contact with the police and feel like you were truly mistreated...contact the supervisor. secondly, do a ride along with your local department....do it in a high crime area....i think it will open your eyes a little to why police do what they do....