[quote=@Dedonus]
<Snipped quote by Hound55>

I know that Law & Order is only a television show, but I remember a show where a witness answered a few questions and then pled the 5th. Then the judge told the jury to disregard his whole testimony, even the parts he did not pled the 5th.
[/quote]

If in the process he'd also perjured himself (and in some other occasions - such as self-incrimination of a crime they've already been charged with) then yes.

Because then it would be prejudicial.

If it's something that a lawyer can draw a string to which they haven't yet been charged with, it's not that stout.

Th 5th covers self incrimination, but not equally in cases where charges are yet to be laid as when they aren't, I believe.