Perfect Polygraph?

This may be a bit of a weird concept, and some may consider a bit of a obstruction of privacy, but here goes...

With all the expense of crime, the effects of legal drugs, the victims and their personal expense...

...If we had a perfect polygraph (lie detector) and could periodically test everyone, while asking pertinent questions regarding involvement with crime or wrong-doing...

Should we do it?

Why, or why not?

(Personally, I would support it, but my confidence at the moment isn't certain... We could use it to get personal views on people making scientific studies to divulge a correct statement of the effects of a certain agent (for example)... It could help prevent horrible crimes...
People would be tempted to use it in regards to religion, but I worry about it's use there... Think of the victims, perhaps as if they're part of your family...)

What do you think?

Wow, that takes alot of thinking.
As long as it was kept very secure, I would support it. It would probably make the world better. But if it got into the wrong hands, alot of ad things could be done...

This would just lead to corruption. Giving people this much power and control would just lead to its abuse. I am against this theory whole-heartedly.

This theory kind of reminds me of minority report.