Everywhere is different as to how DA's use Criminal Investigators. In this state they use them to investigate crime. DA's in this state also run, Judicial Drug Taskforces of multi-agency LEO's within their Judicial Districts. This isn't new, I have a BIL who use to oversee a DA's Drug Taskforce in the early 70's in Lane Co. (Eugene) OR. Back in the days when ANY possession of marijuana was a felony.