'Yelp' reviews about polygraph examiners: so many are fake

Some examiners have their friends write fake positive reviews; some examiners have their friends write fake negative reviews about competitors. Sometimes examiners do such posting themselves, using fake-name Yelp accounts.

Buyer beware when reading positive or negative reviews about polygraph examiners. The lack of guaranteed credibility of Yelp reviews is known so widespread that an episode of 'The Simpsons' was about this topic.