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Saying that when they have taken a polygraph test. that's usually that, but they're saying they haven't taken a polygraph test. does that matter because it's not admissible in court? >> it's not admissible in federal court, but in state court, if you fail a polygraph test -- there's not a reason to take that test. it could just hurt them. if they get on the stand and say they did something and the polygraph says they were lying, that could be used against them for purposes of impeachment. you can see why their lawyer says don't take the test. the fbi clearly doesn't trust them. they changed th...

And trying to help but some of them are really wacky, john, and they are taking away the resources and the time. in fact, just this week, police told me that they got a tip that somebody had been watching the laundrie parents gardening and they saw a hand come up through the soil and hand them a note. and then, they tipped off the police that they believed brian laundrie was living under the house and in the ground there. that is obviously not true. they're getting tips from psychics and people that say they're clairvoyant but none of this has panned out, john. >> randi kaye, thank you as alwa...

Never let his client sit for a polygraph unless he had administered one first and felt they were capable of passing such a thing. our randi kaye reporting moments ago that the family, the laundrie family has not taken a polygraph test, as of now. and no comment about whether they would do so in the future. the cooperation the laundrie family had been giving the fbi -- the father had helped them tour the nature reserve. no longer in accordance with that. he is not going to do that anymore. that was the last time at least for now he will be helping the fbi. coming up, an extraordinary power gr...

September 14th. then it was this week they said, no, it was the day before on the 13th. that has people questioning if they are telling the whole truth. cnn asked their attorney if the family would be willing tie a polygraph test. the attorney said no, not at this time. chris laundrie, brian's father, did go out to help investigators at the carlton reserve and his goal was to basically show them areas and hikes and trails his son liked to go to. he did that earlier this week and came right back home to the house behind me where they have been since their son went missing four weeks ago. now, n...

>> so, what does the fact that this even came up in any shape or form, what does it tell you about what investigators are thinking? >> well, they are focused on the family as to what assistance may have been given. because we know, again, most families will offer some assistance. so what the fbi did, i'm certain of it without knowing particular -- you know, certainly -- but -- and that is that they went and said, look, we want to know what you know, what you don't know. and we use this tool to help us with witnesses so please take this polygraph on the issue of do you know where he is? did he ...