Prison Photography says:
Denison goes on to explain that the officers told him he couldn’t photograph. He told them he could and they acquiesced with the retort “For now.” Shortly before leaving Denison crossed the road to take a picture of an architectural detail. At this point two officers ran down the street, commanding him to cease photographing and then detained him for 45 minutes despite his full credentials, letters of recommendation and helpful explanation of his project and sponsors. Only after word was received that his name wasn’t on the suspected terroist list was he free to leave, albeit with a completed 5090(X) form.