If you talk about a crime in Catholic confession, can the priest?
Certainly not! A priest may not even change his behaviour in the most minor detail due to what he has heard in the confessional. The most extreme example that I heard in the seminary was What if someone confessed to putting a time bomb under the priests bed - could you look under the bed before retiring that evening? Answer: NO, unless you normally looked under the bed. How does this work out in real life? Our retired pastor often got young men (teenagers) who were serving Mass early on Sunday morning, who would come up to him - realizing that they were serving on the altar in front of God and everyone, and were not in a state of grace, i.e. could not receive Holy Communion. So, they would ask Father if he would hear their confession - were talking about three minutes before the procession starts up to the altar. And Father would take the altar boy out front away from the others standing waiting for the procession to start, hear his confession, and then come back into ready to celebrate Mass. Father could not even LOOK at the boy any differently then he had done previously. Nor could he even acknowledge that he had been hearing a confession, since everyone had witnessing him stepping out the door with the altar boy. And if the boy had just confessed to putting poison in his mothers sweet n low - Father could ask the boy, as part of his penance, to fix the situation; but he could NOT tell his mother about it, nor even ask if she had her coffee yet. Much less could he call the police.