Wandersmann wrote on Feb 2^nd, 2017 at 4:41am:

pailryder wrote on Feb 1st, 2017 at 1:53pm: On more than one occasion I was contacted after several years and thanked by couples who felt fidelity testing improved or saved their marriages. I wonder how many real cheaters were falsely cleared by a false negative and used their spouse's misplaced trust in this garbage science to go on cheating with absolute impunity ? ;D ;)

Since the most "skilled" adulterers tend to have marked sociopathic tendencies, this is indeed very likely.  It is those with these same sociopathic personalities that are most likely to "pass" any polygraph interrogation. :o