Take Robert Blake, a man accused of murdering his wife: Over 70 witnesses testified against him, including a few Blake had approached and offered money to kill his wife. The only thing the prosecution didn't have was forensic evidence, but there was no way a jury would acquit a man based on such stupid reasons like "there was no black-light semen."
Poor girl: Raped by an entire circus.
But of course, because we here at Cracked don't tell you about reasonable reactions and logical responses, that is exactly what they did. Robert Blake walked free, probably ticking off a mental note: You can get away with murder as long as you don't jerk off all over it.
Similar fuckery occurred in the case of Robert Durst, whose lawyer got him acquitted by convincing the jury that Durst dismembered his neighbor in self-defense. Forensic evidence on the head would totally prove it, too. If only somebody could find it...
"Me? No, no I don't remember what I did with it. I was too busy bathing in his bl- uh... defending myself."