On the social website Reddit, a user recently asked, "How do polygraph tests tell the difference between a lie and genuine anxiety?"
The post has received more than 1,000 responses, which overwhelmingly express skepticism, scorn, and ridicule of polygraphy:
https://www.reddit.com/r/explainlikeimfive/comments/nv5c7e/eli5_how_do_polygraph_tests_tell_the_difference/