Problem is lack of evidence. Let's say you shot and killed someone. The Officer says "I saw this man withdraw his pistol and fire a multiple shots at a civilian, killing them". You say "No I didn't, I had my pistol out because I just got out of my vehicle and it fell into my hand". There's no dead body that can be brought up, because nobody knows who it is, identifying it is technically metagaming. There's no gun (would have been removed and / or sold, there's no magazine(s) that show the bullets left in them (would have been removed and / or sold). Witnesses are 100% unreliable. The amount of times people will interject into a situation because it's their friend and bullshit some stuff to get them off is ridiculous. This isn't real life, and by that I mean, death isn't a serious thing. If it was, people would be shit scared of the Rebels, they'd hate them. Instead, all I see is "Fuck tha Police" "Fucking pigs" "fuck da popo". Nobody cares for Rebels doing crime, everyone hates Police because Police actually stop stuff. If I stop a man selling drugs, I'm corrupt. If place a murderer in my car, I'm committing Police brutality...it's endless...
Also, the jury are likely to be extremely biased based on their opinion of the suspect and the Police Officer involved. In reality they have no idea who these people are, they are there to provide judgement without risk of bias. Here though, we all know each other.
Just to add onto this...with regards to the removing of evidence, I can see a likely argument being "just take it off them and keep it for evidence in the trial", does this mean that everyone gets a trial before prison..because we are sending...100s per day...and it is completely unrealistic to have a trial for each and every person.
Finally, to you Shanksy. I am incredibly sorry you had such a shit show of RP with the Police if you honestly got charged like you did for no reason. Feel free to provide the name of the Officer (if you got it within Roleplay) and I will happily do my best to deal with the Officer.
What I would definitely recommend to you is, if this was a mistake, report it within Roleplay on the Police Complains Commission. Act as your Lawyer and talk about your case, how your client was potentially mistreated, how he was convicted for a crime he did not commit. Hopefully the Senior Officers can find the Officer involved and gather information from him / her and we can look into what happened...it could end up with you receiving financial compensation if it turns out there was a mistake on the Officers side.