Having carefully reviewed all of the facts and circumstances of this matter, as it does in every case involving firearms-related offenses or any other potential violation of D.C. law within our criminal jurisdiction, OAG has determined to exercise its prosecutorial discretion to decline to bring criminal charges against Mr. Gregory, who has no criminal record, or any other NBC employee based on the events associated with the December 23,2012 broadcast. OAG has made this determination, despite the clarity of the violation of this important law, because under all of the circumstances here a prosecution would not promote public safety in the District of Columbia nor serve the best interests of the people of the District to whom this office owes its trust. Influencing our judgment in this case, among other things, is our recognition that the intent of the temporary possession and short display of the magazine was to promote the First Amendment purpose of informing an ongoing public debate about firearms policy in the United States, especially while this subject was foremost in the minds of the public following the previously mentioned events in Connecticut and the President’s speech to the nation about them. There were, however, other legal means available to demonstrate the point and to pursue this line of questioning with the guest that were suggested to NBC and that could have and should have been pursued.My bolding. This statement indicates to me that the DA approved of the David Gregory's attack on Wayne Lafayette and was looking for an excuse to not have to bring a prominent left-wing journalist to court on a gun law violation. Adam Meckler was not invited to comment by NBC.
Document found at Legal Insurrection, via Insty.
UPDATE: DA who let Gregory off was a friend of Gregory's wife. Another advantage the Adam Meckler lacked.