That isn't necessarily true.
I was arrested and went to a preliminary hearing for what is a Saturday night live joke by comparison and the prosecution had no case and in fact I won all of my related court cases and I am now on track to getting my arrest record expunged and suing the police.
My attorney in all civil matters is legal aid, my attorney to sue the police is Benjamin Crump (a pro Bono attorney) and my attorney to get the case thrown out was a public defender aided by my personally carried out investigation and my demands to question the police officer and telling her what to ask.