There's a scene in Justice League (the movie from 2017) where a policewoman is taking down the stories of three criminals who are wrapped in in Wonder Woman's magic Lasso.
The Lasso does a couple of things:
- Anything anyone who is touching the lasso says is true.
- It compels anyone touching the lasso to speak.
- And it also seems to compel this speech to be relevant. (Isn't magic useful?)
So a person bound by the lasso can't stay silent, or go on a rant about how Superman is wearing his underwear on the outside.
It seems to me that this sort of thing violates a person's 5th amendment right to stay silent. However, this question (ironically about masked vigilantes), asserts that a person's 4th amendment rights cannot in general be violated by a private citizen.
It seems to me that this should also apply to the 5th amendment, and I would find it hard to believe that Wonder Woman would be described as anything other than a private citizen.
Is the confession under the lasso admissible, or is it a violation of 5th amendment rights?
I'm definitely interested in US jurisdictions, but if you live somewhere else, I'd be interested to hear how the issue would be handled there.
As suggested by user6276 in the comments, it's quite possible that Wonder Woman is a deputized in some fashion, since she has various special immunities. It seems to me that if this is the case then the confession could not possibly be admitted (as a violation of 5th amendment rights). Feel free to let me know if that's wrong.