Maryland (SSA HQ location) is a 2-party consent state for recordings. Meaning both parties have to consent to being recorded. It's what got Linda Tripp during the Clinton Impeachment trials.
Hold that phone up. Announce this is being livestreamed so the American public is aware of what is happening. They either walk away and disappear or they are knowingly recorded.
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So you'd be fired for filming/photographing, and/or could face state charges for non-consent.