Dear Mr Harzy and Mr Mark,
I will immediately tell you my judgment in this case, as this case is relatively simple.
First off, if there was a fine to be given for speeding 11km/h too fast, it would have been $50. Reference to the topic
Traffic tickets and Fines in the City Hall section.
The officer, in this case Mark, had all the right to fine you. It seems that he initially asked $75 for, but after you pointed out it should be $50 he lowered it. His willingness to lower it to the right amount shows to me that he didn't mean to issue a fine that is too much. If he was was out to overcharge you, he would have issued a higher amount. This shows to me he did not purposely issued a fine that is too high.
An officer who sees a speeding person with a vehicular object has the right to fine this person with the right amount (referenced before in this topic). The officer that issues the fine is not obligated to show pictures (ingame screenshots) of the amount of speed that the person had. However if the officer does have it, he can proof that the person was indeed speeding. When the judge, me in this case, has a reasonable doubt to believe that the officer wrongly states the speed then he can declare the fine unlawful and the officer will have to pay the fine back. In this case I do not believe that he wrongly stated the speed (80 km/h + 11 km/h). Even though there is no proof of the speed he stated, I believe that he correctly stated the speed as there is no proof either from the sueing party to counter this.
In the topic
Traffic tickets and Fines it states that the officer can suspect you if you do not pay the ticket. The officer in this case was simply right to threaten you with suspectation.

The first and most important rule is to be always friendly with the traffic offender. After you commanded the offender to pull over, you must explain exactly what their done wrong and eventually the price of the ticket/fine offender is obligated to pay. In case that their is refusing to do so, you must warn/explain the offender about the consequences - becoming a suspect and eventually getting arrested. If the offender is still refusing to pay you are fully authorized to suspect for the traffic violation their committed.
After the person got suspected, he/she has a right for investigation if there was no evading from police. In case that it is proven by investigation that the ticket fine is justified, the person is offered with two options. One option is to pay for the ticket fine + compensation for the investigation, where compensation is of the same amount as the fine itself. In case that the person does not want to pay for the total fine, he/she is to be sent to jail. If needed, further discussion should be continued with a member of LCPD Command Staff.
Also from your story and your evidence I cannot see any abuse from the officer, since the payment of $50 is correct and he had the right to threaten you with suspectation. Mark will need to start his own court case if he wants to demand an apology from Harzy Crozier, though the chances will be slim that he will succeed. Also I do not see any reason why Mark should apologise to you (Harzy) since he executed his job lawfully. I do however, expect professionalism from both parties. That means you will both behave like you should, law abiding.
Therefor I will dismiss this case, all the demands are dismissed.
This is my judgment, but I will give you both the opportunity (in one reply) to come with evidences/proof that my judgment should be otherwise.
Temporary Judge
James Conway
(Want to be a Judge? PM me or meet me in Liberty City)