All eyes have turned to Deborah Bradley and Jeremy Irwin in the mysterious disappearance of baby Lisa Irwin.

Deborah Bradley, Lisa's mother, said in an interview with The Associated Press that police accused her of being involved in her daughter's disappearance after failing a lie detector test.

They said I failed (a polygraph test), Bradley, 25, said. And I continued to say that's not possible because I don't know where she's at and I did not do this.

Bradley claims she was never shown the polygraph test answers and denied knowing anything that happened to baby Lisa.

'You did it. You did it. And we have nothing,' she said detectives told her.

Retired FBI Agent Jeff Lanza told FOX 4 that failing a polygraph test does not mean someone is guilty.

If you've registered some deception, that's an indicator that you're not telling the truth, Lanza told FOX 4. However, it doesn't mean you're guilty. It's just an indication that you're deceptive about a particular question or questions on the polygraph exam.

Bradley and the baby's father, Jeremy Irwin, claim the 10-month old baby Lisa was stolen from her crib late Monday night or early Tuesday morning.

Irwin told police he is also willing to take a lie-detector test, but police replied that it was unnecessary.

The main problem I think that we're facing is that everybody [else] has an alibi, Irwin said. I was at work. I've been cleared. All these other people we were worried about ... the FBI said they've been cleared. The only one you can't clear is the mother that's at home when it happens 'cause there's nobody else there.

Irwin, an electrician, said he returned from work around 4 a.m. Tuesday to discover baby Lisa was missing. Bradley claimed she last checked on Lisa around 10:30 p.m., before falling asleep in her bed with her six year old son.

Bradley and Irwin claim they searched frantically for baby Lisa early Tuesday morning, but found only the front door unlocked, a window opened, house lights turned on, and three cell phones missing.

Suspicions, however, further turned towards Bradley and Irwin when police announced late Thursday that the parents had suddenly ceased cooperation with the authorities after a full day of questioning.

Irwin's sister disputed the police's claim, announcing the family has never stopped cooperating.

Lanza said the parents' definition of cooperation is probably different than the police's.

Police's definition of cooperation is to answer any questions that we post to you even if it focuses on you, Lanza said. The couple's definition is, 'well, we'll cooperate, but not if it's focused on us.

Bradley and Irwin went on the Today show Friday to explain their position and clear the air regarding the details of the ongoing investigation to find baby Lisa. The case so far has turned up few leads and no official suspects.

Matt Lauer began the interview by telling baby Lisa's parents that he has rarely seen police make a statement that the child's parents are uncooperative in all the missing children cases he has covered -- an accusation Kansas City Police aimed at Irwin and Bradley late Thursday.

We were at the station yesterday being interviewed again, and I just had reached my boiling point and asked them, 'Guys, I can't do this anymore today, I need a break, (and) I can't answer any more questions,''' Irwin, 28, told Lauer. The next thing we knew was the press conference yesterday. We want to make sure that we tell everybody that we're still cooperating, we're still talking to police, (and) we're still doing everything we can to try to find Lisa and bring her back home.''

Bradley and Irwin explained that they take issue with the way police are handling the case. They say detectives have tried to turn them against one another.

You see stuff like this everywhere. You watch the TV, and there's some crazy person doing something insane. There's been too many times stuff has happened, Bradley said. They have to assume what's worst... but it felt like it was taken really, really far.

David Finkelhor, director of the Crimes Against Children Research Center based at the University of New Hampshire, is not surprised by the police's allegations.

Suspicion almost always falls heavily on the parents, especially when it's young kids, Finkelhor explains. For a parent who has been a victim of a true stranger abduction, this is devastating. You're dealing with the loss of a child, and police are considering you as one of the prime suspects, Finkelhor said. You can get non-cooperative because the family is feeling mistreated by police.

Police continue to actively investigate the case, although, as ABC reports, they have shut down their remote location near the family's home and have removed the crime scene tape.

Baby Lisa Irwin, nicknamed pumpkin pie, is described as white, with blond hair and blue eyes, about 30 inches tall and weighing 26-30 pounds. The family says that she was last seen wearing purple shorts and a purple shirt with white kittens on it.

If you have any information on the girl's whereabouts call the TIPS Hotline at (816) 474-TIPS.