Today, like many days in the past few weeks, the White House Press Briefing with Sean Spicer was audio-only, i.e. no cameras allowed. My question is, how is this camera ban enforced? Does Spicer ask the Press Corps to promise to not to record video? Or does the Secret Service prevent the cameramen from entering the briefing room, or what?
I'm basically trying to figure out, what exactly stops a reporter from recording video from his smartphone?
EDIT: In addition to making briefings audio-only, the White House is also restricting when the audio can be released; reporter are not allowed to stream the audio live, instead the audio can only be broadcast after the briefing is over. Well, today one reporter violated that restriction and streamed the audio live on Periscope; see this Washington Post article for details. It remains to be seen if this reporter will face any consequences or if other reporters will decide to do the same.