Anna Walker, 31, recorded a Homeland Security Investigations agent who confronted her in a Target parking lot after she followed his unmarked vehicle. The agent threatened her with arrest for impeding and took photos of her license plate. Five days later, Walker's Global Entry status was revoked without explanation. After HuffPost inquired with DHS, her status was restored within days. The article reports similar cases involving other individuals losing Global Entry privileges after observing or recording federal agents.