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They set up a little screen at the end of the truck and then came for us one at a time, unshackling us and leading us to the back of the truck. As close as I could work it -- counting seconds off in my head, one hippopotami, two hippopotami -- the interviews lasted about seven minutes each. My head throbbed with dehydration and caffeine withdrawal.

I was third, brought back by the woman with the severe haircut. Up close, she looked tired, with bags under her eyes and grim lines at the corners of her mouth.

"Thanks," I said, automatically, as she unlocked me with a remote and then dragged me to my feet. I hated myself for the automatic politeness, but it had been drilled into me.

She didn't twitch a muscle. I went ahead of her to the back of the truck and behind the screen. There was a single folding chair and I sat in it. Two of them -- Severe Haircut woman and utility belt man -- looked at me from their ergonomic super-chairs.

They had a little table between them with the contents of my wallet and backpack spread out on it.

"Hello, Marcus," Severe Haircut woman said. "We have some questions for you."

"Am I under arrest?" I asked. This wasn't an idle question. If you're not under arrest, there are limits on what the cops can and can't do to you. For starters, they can't hold you forever without arresting you, giving you a phone call, and letting you talk to a lawyer. And hoo-boy, was I ever going to talk to a lawyer.

"What's this for?" she said, holding up my phone. The screen was showing the error message you got if you kept trying to get into its data without giving the right password. It was a bit of a rude message -- an animated hand giving a certain universally recognized gesture -- because I liked to customize my gear.

"Am I under arrest?" I repeated. They can't make you answer any questions if you're not under arrest, and when you ask if you're under arrest, they have to answer you. It's the rules.