FBI works the same way. I remember during a murder investigation the FBI told the media one thing, while telling the family, "here's what's really going on." It was funny to see the media patting itself on the back all along.
I was on a jury that deliberated and found a perp guilty.
As the jury was leaving, after the trial, the prosecutor came by and thanked us for our service, and then told us some REAL horror stories about the dude we’d just convicted.
Stuff that could not come out during the trial.