Cypress, if we were to throw out the polygraphs altogether there are still so many reasons to believe that Terri is connected to Kyron's disappearance...there is something so...off...about her.
Try to reconcile the perfect mother and talented teacher image she tried to present with the child endangermant convicted, sexting, lying (weekend Kaine moved out/reporters) reality of her personality.
How could police not question her activities that day closely?
And why wouldn't they be alarmed by an hour or more of uncorroborated time on that day?
The child endangerment was related to her DUI, which was an isolated incident. I don't know any parent who hasn't doesn't something incredibly stupid and/or dangerous where their child is concerned. It's awful that it happened, but it was an isolated incident. IMHO, I don't think an isolated DUI has any real bearing on this case.
I'm very wary of posting this, but I'll give you some insight into how I view Terri. IMHO, and without attempting to diagnose Terri, she has some unhealthy views about sex. Perhaps they are related to low self-esteem, perhaps they are related to abuse she's endured. Who knows, but I think these unhealthy views strongly govern her choices about men and how she deals with stressful situations. In general, Terri strikes me as the type of person not very confident about herself. Over the years, she's endeavored in many ways to boost her self-confidence (marriages, body-building, education), but it's something that's never come together for her. Her view of self is very closely connected to her feelings of worth, which is why she wanted to have liposuction, which is why she was worried that Kaine thought she was fat and unattractive. IMHO, her feelings of self-worth are closely related to how loved she feels, etc., which is why her relationships are erratic and not sustainable -- her feelings of self-worth frequently change and what follows is her feeling of being loved frequently changes and causes problems in her relationships. In that way, IMHO, she is needy.
IMHO, Terri isn't lying about how she met Kaine. IMHO, Kaine told her it was over with Desiree and they proceeded with their relationship. Perhaps Kaine told her what she wanted to believe, what made it convenient for her to proceed with their relationship, he provided her with a way to pursue him without feeling guilty, but the fact remains that this is what Kaine told her (in an interview, he explained the relationships this way). Obviously, Desiree has a different viewpoint. Is Desiree wrong in her viewpoint? No, I don't believe she is wrong. I believe it may not be as cut and dry as Kaine made it seem to Terri, though. Is Terri wrong in her viewpoint? No, she's not, IMHO. However, the disparity between what the two women believe is heavily influencing Desiree's overall opinion of Terri, IMHO. From the very beginning, Desiree has believed Terri is a liar. Is she, though? If Terri believed and repeated what Kaine told her about Desiree at the beginning of their relationship, is Terri the liar? No, IMHO, but Desiree obviously believes she is and this belief has governed Desiree's opinion of Terri, perhaps unfairly, for seven years. Additionally, Terri became the primary caregiver for Desiree's son, and I believe we can all agree that this would've been difficult for Desiree. This, too, has influenced, perhaps unfairly, Desiree's opinions of Terri.
For the past seven years, Terri has been attempting to get in Desiree's good graces -- being the go between for Kyron by driving him to Eugene for his weekend visits with Desiree and Tony, being somewhat involved in Desiree's other son's life, taking a lot of pictures of Kyron and tagging Desiree on Facebook, e-mail correspondence with Desiree about Kyron. All of this tells me that Terri wants Desiree to like her. In the aftermath of Kyron's abduction, a lot of things were said, but if you read early news reports, this blended family had handled things rather amiably. There was a lot of talk about making it work for the children, etc. Even though Desiree believes Terri is involved, she's never called Terri a bad mother, she's never claimed that Terri was abusive toward Kyron; in fact, she's said the opposite. She said that although Terri couldn't replace her, Terri has given Kyron what he needed. It's widely reported that Terri loves children, that she was helpful with them, attentive, etc. Desiree and Kaine may believe it's a lie now, because they believe Terri is responsible for Kyron's disappearance, but her actions for seven years told Desiree and Kaine that she loved all the children in this blended family, that she didn't mind caring for them, being involved in their lives, or going the extra mile.
So, then, Kyron disappears. Desiree suspects Terri from the beginning (she admitted this in an interview). But, also IMHO, Desiree's unfairly biased opinions about Terri frame Desiree's mindset from the outset. IMHO, Desiree doesn't keep her feelings a secret. Either verbally or non-verbally Desiree communicates to Terri that she holds her responsible, even if at first it is that Desiree blames Terri because she was the last parent to see Kyron. IMHO, this is what sets off Terri's defensiveness. Five interviews with LE within the first day of Kyron's disappearance wherein they are questioning her whereabouts that day magnifies this feeling in Terri. Terri retreats to a familiar comfort, perhaps her escape -- the Internet, and finds that people are already blaming her, calling her the evil stepmother, etc. (I read these types of comments the first day, in the first articles). This adds up to Terri feeling persecuted. If she is innocent, then of course she feels guilty. She was the last parent to see Kyron. Terri's a talker, she emotes when she's angry or frustrated. She starts acting defensive because she feels like everyone is blaming her. Desiree observes Terri and thinks her being defensive is a sign of her guilt, that she has something to hide. The cycle continues, with Terri feeling persecuted, and Desiree taking Terri's odd actions a sure sign that she's involved.
For the time being, Kaine supports Terri. He can't believe she would hurt Kyron. LE believes Terri's alibi sounds bogus. They press her about it. She takes a polygraph. Because her alibi sounds bogus, LE indicates she failed the poly in an attempt to smoke her out. There's a lot of pressure (financial, social, etc.) on LE to solve this case. Terri tells anyone and everyone who will listen that she failed the poly, but she doesn't understand why, because she was where she says she was.
LE doesn't pass along to Tony, Desiree, or Kaine that they are lying to Terri about the results of her polygraph. The other parents therefore believe she failed. IMHO, it's entirely possible Terri lies at this point, trying to cover her unverifiable time by saying she went to a couple of stores (Alberton's) that she never went to that day. She may or may not have anything to hide, but she can't verify her time either because she really was driving the baby around or because she was engaged in some kind of illegal or illicit behavior unrelated to Kyron. At this point, she panics, not because she is guilty but because she knows the others suspect her. IMHO, the walls closing in on her increases ten-fold if she was engaged in some type of illicit behavior. I believe this is possible, but I also believe at some point she reverts to her original story. She either says she was confused about Alberton's or finds a way to discount the lie and reverts to the story she recounted to her friend via e-mail on June 5. This waffling creates some confusion and suspicion among the other parents and accounts for their comments; however, Terri's timeline is tight, too tight for her to have done this alone, and little by little her initial timeline is verified. At this point, however, LE and Desiree and Tony are convinced Terri is involved. Thus the accomplice theory is born, IMHO.
At this point, she and Kaine begin fighting. He doesn't directly accuse her of anything, but the tacit suspicion is there. Still, though, she puts up a front. Then comes the sting, the RO, the divorce papers, Kaine and baby K leaving. At this point, Terri shuts down, but Michael Cook enters the picture. He starts doing nice things for her around the house; in contrast to the apparent innerworkings of her marriage to Kaine, Michael pays attention to her. He defends her in the press. Most people would get rip-roaring drunk if they were under the amount of stress that Terri was under, but that's not her vice. Alcohol is only a symptom of a larger problem. Also, IMHO, Michael Cook is a plant -- either of his own volition or at the request of someone else. He has information about how to work her over, about how to get the information he wants from her. Perhaps he prods her into sexual conversation, jokes around, perhaps not. I strongly believe sex is Terri's vice -- it's how she gets what she wants from men, it's how she copes, it's how she feels self-worth, it's the way in which she feels valuable in a relationship, etc. So, everything is gone, and she wants to feel something other than blamed for the disappearance of a boy she's raised, and so she engages in this completely inappropriate behavior. And the entire world finds out about it.
The sting and the increasing suspicion on Terri prompts her to hire Houze. For some completely inexplicable reason, Terri's good friend Michael Cook relays their conversations to LE. Houze tells Terri it's his way or the highway. She acquiesces to his demands. He works quietly behind the scenes.
In the absence of any real evidence, this is how I explain Terri and this situation.