[Clubber]

To be fair, polygraph tests aren't admissible as evidence in court, but I completely agree with your larger point. You also left out drug sniffing dogs, which are just a prop for the justification of an otherwise illegal search, and apparently drug sniffing cops too. There was recently a case where a cop claimed in court to have smelled unburned pot from several cars away while driving on the interstate. This was fortunately thrown out but it's not guaranteed.