I just served on a jury and in our case, the cop was a lying scumbag, the prosecutor's expert witnesses were people milking the taxpayers to provide the evaluations that the state wanted to hear for thousands of dollars per hour, the defense's expert witnesses copy-and-pasted an evaluation from another client but didn't bother to proofread before the prosecutor brought up that they had the wrong name in the text, and the defendant raped and molested multiple kids below the age of 8, some still in diapers.
I feel like many court cases are textbook instances of Everyone Sucks Here. I needed therapy after the case because it had so shaken my faith in both the justice system and humanity.
https://en.wikipedia.org/wiki/James_Grigson
Forensic sciences and experts hired by prosecutors is a big problem.