I'm not necessarily down with the truth serum, but I also don't see the problem with a liberal usage of lie detector tests. Sure, they can be beaten... but not by many street punks, I'm sure. I know if I were wrongfully accused of a crime and I had this choice:
1. Beaten till I confess
2. Held for many days till I get my new expensive lawyer to spring me
3. Cooperate fully, but with people who KNOW I'm guilty (When I'm not)
4. Take a lie detector test and prove (to some degree) I'm innocent
I'd go for #4 every time. It may not be perfect, but if it keeps the cops from treating me like a murderer (That is their job, intimidation is a part of solving many crimes), I'm down with it. As an innocent dude, that'd be the easiest way to direct the cops to knock down someone else's door or at least find the real evidence.
I know, I can't be compelled to incriminate myself. As a guilty suspect, I'd probably avoid it like the plague... but if I did avoid it, wouldn't that tell you something?
This isn't limited to polygraph, there are also vocal and other lie detector methods that could be used.
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