Help Fight the wrongfully accused

I am 42 and never been in any kind of trouble until recently. I borrowed a vehicle from my father in law and not thinking about there being a possibility of something illegal in the vehicle I headed to the dollar store to get necessities for my family. I had my GPS app on as the vehicles speedometer didn't work and next thing I knew I was being pulled over. I learned that the law enforcement is legally allowed to lie to you during a traffic stop. He stated I was doing 70 in a 35 zone and because I told him I had proof he was lying to me and asked him to be honest he called for back up and treated me as if I was a criminal. I'm now in court fighting against the system as the court appointed public defender basically said my evidence was insufficient because his dash cam showed he had to speed up to get to where I was at 70mph. I have spoken with criminal defense lawyers and all of them told me my case is beatable. I've never done anything like a fund raiser before but for to my current financial situation I have no other choice. My family has been struggling ever since my sister in law bankrupt the family business that had been for 30 years.I'm asking for help from anyone that's able to help so we can expose this corrupt system we live in today. The total cost of a criminal defense lawyer is 7500 but I need to come up with $3000 for them to take over my case and then I would be able to make payments for the remainder. I can do payments but I'm in a situation where I don't have the first half they are asking for. Thank you in advance and God bless all of you.