One of the things that scares me about the US criminal justice system is that it relies almost entirely on magical thinking and torture to secure convictions. I don't believe anyone is guilty unless they were literally photographed holding the bloody knife while standing over the body and even then I'll need some convincing to rule out potential mitigating circumstances.
Didn't do it? Tough shit you're still going to spend three years in Riker's, lose your job house car and kids, get horrible trauma, and essentially lose everything you ever had and good luck getting back on your feet.