A decision is expected Wednesday on whether a murder confession to undercover police by Joseph Caissie in Carol King's death be allowed at trial.

The operation, which includes participation of police forces across the country, has undercover officers posing as potential clients in the escort sex trade.

Michigan police currently enjoy immunity from prosecution for having sex with prostitutes on the clock.

It is too soon to say what effect this ruling will have on future 'Mr. Big' scenarios.