Q&A Is My Husband Lying or is the Polygraph Inaccurate?

Hi Rick, EMS truly have our relationship another shot; and put us a potentially hopeful path. Thank you. It was there we found out my husband was a sex addict and at that point of course he swore he had given me full disclosure. About 8 weeks after EMS (due to SAA, seeing a CSAT, and ultimately God leading him to) he was finally able to give me the real full disclosure and pass a polygraph. Evidence came up that made me question his recovery so he offered to take a polygraph. He failed it. Miserably. It doesn't add up. He told his story in SAA and got hit 60 days of sexual sobriety chip last night and failed a poly he volunteered to take this morning. He's adamant that despite his deception in the past he is telling the truth. He even bought a home security camera to see if his former AP is planting evidence in our house. My question is, how accurate, really, is a polygraph? His CSAT doesn't believe in them. But I realize if I discredit this one then I must discredit the one he passed after full disclosure. Thoughts?