I’m sorry you feel that way. A polygraph test is only as good as the examiner administering the test. I gave hundreds of exams and trained many Law Enforcement examiners. I would not have worked years in a profession that I didn’t see produce the results of being able to verify deception and truth when utilized properly.
Maybe I’m wrong. Also maybe truly skilled examiners can make them work. I also suspect that with your expertise you probably could tell when someone was lying even without the equipment, which acted to verify.