Well, maybe you should have been at this course offered by the California Narcotics Officers’ Association:

With the growing use of informants, wiretaps and sealed search warrants, it is imperative that law enforcement can conduct investigations and prosecutions without having to disclose sensitive information to the defendant and his attorney.

Because if government, at all levels, has learned anything over the last decade or so, it’s the importance of secrecy.  After all, it’s not about justice.  It’s about getting convictions and pumping fresh warm bodies into the prison industrial complex.  It’s about law enforcement versus ordinary peasants and it’s about winning.