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Which is how my cousin spent 30 years of his life in prison on a murder charge the DA knew my cousin did not commit. Despite my cousin having solid alibis, and a known informant providing testimony to the DA regarding the actual murderer, they stole my cousin's life instead. He was up against the death penalty as the DA hid any evidence of my cousin's innocence. It's by simple "luck" he received life in prison and not execution. His name was cleared decades later, and nothing happened to the DA or anyone complicit in trying to kill an innocent man. 
Prosecutors will actively break the law to target people they know are innocent. It's easier than actually doing their jobs. 
My cousin faced death because he refused to lie.
Prosecutors are only concerned about getting a conviction, not with getting to the truth. They don’t care if an innocent person goes to prison as long as they get the win.