http://www.politics.co.uk/1/partypolitics/blunkett_promotes_tagging_extension_2711933.htm

It seems like a good idea in principle from Blunkett, However I can't help feeling it's just another soundbite.

I've read that people with psycopathic tendancies are not able to give an accurate reading on these tests because they don't give the normal responses needed to generate the correct indications on the lie machine.

Why don't we use these machines on Politicians?