He kept his head down and his eyes on the gray industrial carpet while Officer Ray Vance pulled open the heavy inner door.

“Assistant District Attorney Miller is ready for us,” Officer Vance said, hitching up his duty belt as he waved us down the narrow hallway under the fluorescent lights.

I laid the black flash drive on the laminate desk between two piles of manila file folders.

The drive held four video files copied from the garage security system, each one marked with an exact date and time from October.

A young woman in a fitted dark suit plugged the drive into her computer and hit play.