As Phizz says... the Watchtower can use whatever 2 Witness or 30 Witness rubbish they want for matters pertaining to their organizational mumbo jumbo. Who cares. They can say ah ha no Witnesses, and make the bastard an elder, they can make him a governing boob, who cares.
But when they hear that a crime has likely been committed, they must inform the authorities. The relationship between police and criminals is unaffected by their personal feelings or judgements.
I was exposed years back to a case that involved illegal wiretap. I was told not to report this to police. More recently I was exposed to a case that involved financial fraud over $50k and I was told not to tell police. All crimes are hid in Watchtower land.
I wonder how elders would react in the case of murder. Now, murder is a capital offense. I will imagine that elders would not report it, but would understand that there is a body and the police will certainly be involved. So their reaction would be to disconnect and run. They would later tell police that they had no knowledge of it, like at the ARC... “I don’t recall”