Howzat
I'd Rather Be At The Hideaway
Likely a different standard that what I deal with. Take that for what it's worth.
For admissions in civil cases, though, you can challenge the competency of the person making the admission.
The documentary does not include all of the arguments raised for the motion to suppress the video admission of the nephew. I was surprised, though, that the judge allowed the admission for two reasons. First, the interrogating officer suggested a lot of the facts to admit (at least by what was shown on the documentary). Second, it seemed clear from the video that the nephew didn't have the mental capacity to understand what he was doing. For example, he asked if he would be able to return to school within an hour of the interview because he had a project due.
With all of that said, the legal standard could be completely different than what I work with.
Legal standard or not. That kid had no clue which way was up and there was no physical evidence to support anything he said.