As I understand it, "doing their job wrong" in this case includes entering compelled testimony - compelled on the grounds that it would not be used in a prosecution, eliminating any 5th amendment barriers - and then promptly using this compelled testimony in a prosecution.
So yes, it is very much about evidence. It's also about a prosecutor discarding the civil rights of a suspect when inconvenient.
Note this appeal isn't about the evidence. It's procedural on the prosecution doing their job wrong.
As I understand it, "doing their job wrong" in this case includes entering compelled testimony - compelled on the grounds that it would not be used in a prosecution, eliminating any 5th amendment barriers - and then promptly using this compelled testimony in a prosecution.
So yes, it is very much about evidence. It's also about a prosecutor discarding the civil rights of a suspect when inconvenient.