short true story. In college, I worked at the ABC liquor store part time. I finally had a date with this girl, but my manager called me, begging me to come in because reasons, but he would give me double time if I did, as he was so desperate. I told my date I would get the double time and go on an even nicer dinner when I got paid. I did not get my double-time. When I asked him, my boss said “I’m not giving that to you. I don’t care what I said.”
I figured out how much he owed me and took a bottle of bourbon as close to that sum and did not it pay for it. About a week later (I’m sure unrelated to that one bottle), they asked everyone to do voice stress analysis tests to see who is stealing from the store. They asked me several questions like “did you ever take anything that didn’t belong to you?” As i absolutely felt I was not stealing, I said “no” confidently.
I passed. They fired two other guys. That is the thing about polygraphs - sociopath who feel no guilt pass those things easily. Or people who feel they have a legitimate reason for doing what they did. It’s only us normal guilty people who start to sweat and act differently because they know they did something wrong that it MAY catch. Even that is dicey.