Maybe they can try crystals, or magnets.

Ooo! OOO! Photograph their aura!

As long as they got their Luigi board from a witch, or a vegan.

It should be pretty common knowledge that lie detector tests are completely bogus and can’t be trusted. They’re not admissible in court cases. Polygraph tests are proven to be made up pseudoscience.

They might as well try using crystal pendulum tests to dowse out the national security threats.