Did anyone die as a direct result of Ross giving an order / paying for a murder?

Did the police investigating Ross misrepresent these murders to him while they were occurring?

Did the police investigating Ross attempt to enrich themselves by stealing illicit funds from his drug enterprise or by selling him details of the pending investigation?

I'll give you that the courts have repeatedly held the police can legally do most of these things, and that even having lying/stealing cops running the investigation doesn't invalidate the fruits of that investigation. Perhaps you could also concede that a lot of observers are going to have difficulty seeing the difference in these two shades of grey?