If I read Dreher's post correctly, the priest himself is somewhat implicated by what was ostensibly said, so I don't see why he couldn't hide behind the Fifth instead--maybe they gave immunity and he's not allowed to reject it, idunno.
The other thing is that the only response if the priest is brought before the jury would probably fall under contempt. He can answer any question posed, but cannot identify the penitent (ie, "is this whom was in your confessional"), he could not answer. He's also not permitted to say, "I don't remember", or say, "no, it's not".
This is one reason why confession behind a screen remains an important part of the sacrament, so that even if the priest did hear the confession, the priest may not be aware of whom was confessing.
Also, he's not permitted to act on anything revealed to him in the confessional. He cannot hear and then, say, call the police. He can refuse to provide absolution unless the penitent turns himself in, but that must be done voluntarily.
He can, however, act on information provided outside of the confessional. Say someone comes to him, outside of confession and provides credible evidence, he's require to report it and investigate.
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