I can see that prosecutors may feel pressure to convict someone that they "know" is guilty but that doesn't make it right. It's not right when I policeman plant

I can see that prosecutors may feel pressure to convict someone that they "know" is guilty but that doesn't make it right. It's not right when I policeman plants evidence and it isn't right when a prosecutor decides he would rather intimidate the accused instead of win his case fairly in court.