If money laundering is taking place in any given part of the world, assuming that its the developing world,?

is it that law enforcement officials, banking, and government people are just turning a blind eye or looking the other way to allow it to keep happening? why can't money laundering in the developing world be fully decomissioned alltogether? lets say that money laundering is taking place at a privately held bank, if government, banking, and law enforcement officials took a cut of that money would they allow it to occur indefinitely or not? would there be pressure from the outside to stop it or not? can a law enforcement expert please tell me why this cannot be fully decommissioned?