the polygraph is still struggling with bans in courts and other limitations (ironically in the US, whose scientists have developed it mostly)
It wouldn't matter who developed it. We have at 5th amendment.
Amendment V
No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a grand jury, except in cases arising in the land or naval forces, or in the militia, when in actual service in time of war or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation.
Yes, indeed. But thankfully the polygraph finds is best use in Post-Conviction Sex Offender cases which prevents these criminals roaming your streets and claiming more victims.
Sadly in the past 100 years the polygraph has been used by a lot of incompetent police officers who had no idea what they are doing with it and it owes it's bad renomee to them.
And how does it do that?
In the States every sex offender on probation has to take a polygraph test regarding whether or not they had similar sex acts/offenses similar to their crimes. If they fail the test, they go back to prison.
misfired a comment. :)