I can understand getting the warrants - even though the apartment is a crime scene, they still may want to dot all the i's and cross the t's, so the case doesn't get thrown out on a technicality. I also understand listing the marijuana on there - in the interests of completion, for the same reason above, you don't want to omit anything you find and risk having the investigation questioned ("Oh, so you didn't list the pot you found as a result of the warrant? What other exculpatory evidence did you hide that might show my client's innocence?")
But leaking the warrant is bull ****. If I'm the judge on that case, I'm throwing the results of that search right out.