"He knew something, but when they put him on the stand, he refused to answer any questions. He got off on a technicality."
"They found the body right there in his house, but his lawyer said they didn't have a warrant or probable cause or something. He got off on a technicality."
Folks, the Bill of Rights is not a "technicality". The very mechanisms that keep some hypothetical jackbooted thug from wandering through your front door and rifling through your unmentionables drawer whenever they get the urge are the same ones that mean occasionally somebody who is guilty as sin is going to walk. Like some game of Constitutional Jenga, every prop you knock out of the structure to make it easier to catch the guilty makes it that much more likely that the whole edifice will collapse right on top of you, (if it hasn't already.)
The price of the Bill of Rights is that people are going to say things you don't like. The price of the Bill of Rights means that sometimes people are going to get shot accidentally or on purpose. The price of the Bill of Rights is that sometimes the guilty are going to get away with murder.
The reason the police have to dot every "i" and cross every "t" when they rightly go after Mario Mafioso or Suzi Scumbag is so that they have to dot every "i" and cross every "t" when they wrongly come after you.
Every law you pass to make it easier to get the bad guys winds up being used against the good guys. Every one: RICO, The PATRIOT Act, all of them. If you hand the government a hammer, it's only a matter of time before they stop pounding nails and turn around and crack you in the head with it.
We ignore that at our peril.