The law makes no distinction between music teachers and journalists. The elements of any crime concern the actions of a party, not who they are or what credentials they hold Journalists have no immunity or special privileges conferred to them by the First Amendment. The occupation of the offender is relevant only to the extent that it goes to intent, which is an element of most criminal offenses.
There are many similarities, and differences between the Baker and Lemon cases, which make for an interesting discussion.
Between 1975 and 2008, you could not even POSSESS a handgun in Washington DC, not even in the privacy of your home. The rate of gun violence in the District exploded, proving the adage, "If guns were outlawed, only outlaws would have guns". A Supreme Court case overturned the DC law, but the current revision is still very restrictive.