All you need to do is read a press release the DOJ puts out to know this is true. Especially the cases they lose. The judicial system is adversarial by nature

All you need to do is read a press release the DOJ puts out to know this is true. Especially the cases they lose. The judicial system is adversarial by nature. The goal of the prosecution is to put forward its best possible case that basically means assuming the worst of any piece of evidence.