RE: Enormous missed opportunity
"If we routinely lie-detected all possible suspects and then concentrated on those that had 'problemmatic' readings we would get a lot further with crime detection than we do now. Admittedly some people can lie their way to clean readings and some innocents get caught but no-one has developed those ideas to explain why it's just rejected out-of-hand.
It's the same with DNA databanks, RFID chips etc. People are not protecting freedom. They are worried they are going to get caught doing things they know are illegal."
GAH!!! What you forget is just how lazy your average human being happens to be. Why bother going through all all of that tedious detective work? No need to check alibis, figure out motive, analyze clues, etc. Just use the magic techno-bullet to finger the criminal.
What's that? Oh, the lie detector fingers nearly 10% of every group as potential suspects worthy of further grilling? Well, they should be happy to be grilled for days just to catch that nasty murder/rapist/grafitti artist. What's that? We keep dragging in the same 20 "suspects" day after day because they happen to:
1. be nervous around police officers
2. live in an area where murders occur
In the USA, that would essentially mean dragnets for all the folks living on the poor side of town.
The reason I hate this stuff is because it gives petty little bureaucrats the power to endlessly harass folks who didn't do anything wrong.