Exhibit A:
Although she got 12 years, which is not exactly scot-free.
From a fifth amendment standpoint, being pardoned effectively IS being immunized – you can now be forced to testify regarding the acts for which you were pardoned without the need for an immunity deal. However, the witness’s fifth amendment rights would apply to any testimony outside of those pardoned acts, and the prosecutor could grant further immunity to remove the right. And would have to consider all of the same points I raised in my previous post.
However, I also imagine that sussing out what specific testimony could be compelled by virtue of the pardon would be a word-by-word battle.
Interesting fact I didn’t know. You can refuse a pardon but you can’t refuse immunity.