I meant, an example from the show. 😛
I'm assuming you watched an episode where a criminal was let-off due to some technicality.
But yes I'm aware of the technicalites you're talking about- especially due process.
When I was interning at a police academy a couple years back to get my guard card, my instructor told us a story about a guy who got off due to a technicality- the lesson was supposed to explain to us the importance of due process.
Basically, a farm-owner hired some Mexican to do odd jobs around his house. After a couple of weeks the farm-owner found the Mexican passed out drunk on his farm, so he fired the dude. The Mexican threatened to beat the shit out of the farmer, so the farmer took an axe and crushed the Mexican's skull. He panicked after that, dumped the Mexican's corpse into the Ford F-150 he owned, and pushed the truck off a cliff a couple miles away from where the farm.
Police found the body, did an investigation, and charged the farm owner with 1st degree murder. At one point in their investigation, they took him in for questioning and secretly filmed the session, during which he admitted to murdering the Mexican and trying to hide the body.
The police submitted the video as evidence, and the Judge ended up throwing the case out because the police had neglected to tell the farmer that they were filming him prior to the questioning. So the guy walked.
One could argue that that's bullshit- the guy admitted on tape to killing the Mexican, and his bloody fingerprints were found on the axe. On the other hand, though, how does the jury and the judge know that the police didn't put a gun to the guy's head and force him to incriminate himself on the tape? They certainly could have done so- it's happened many times in history before- so if that evidence was used to convict the guy, the Judge could quite possibly be sentencing an innocent man who was coerced into incriminating himself.
That's the point of due process- basically. It's to cut off any attempts to force someone into incriminating themselves.
Ironically, most of our legal system is a knee-jerk reaction to tyrannically countries like Imperialist Great Britain, the Soviet Union and the like. We as a people are in general just highly paranoid about Government corruption, which is interesting, because our government sucks.