Much more information can be found below, if you’re interested.
Ah, that’s an interesting case. Each one made statements on forms that said the statements could not be used against them in a criminal trial.
The trial judge said using those statements tainted all the evidence, and dismissed the charges.
The appeals court said that the judge needed instead to evaluate the evidence against each defendant individually, to see what evidence against THAT defendant was tainted by the use of HIS testimony.
For example, one defendant’s testimony could be used to charge the OTHER defendants, even though it couldn’t be used against that defendant. So if the prosecuter can argue that evidence against a defendant was based on the testimony of a different defendant, that evidence should be admitted.