Take a photo of a barcode or cover
I liked this a lot! Even though at the end it hit some heavy duty computer speak that I kind of took on faith. It's set in the same future state as Halting State, which I loved, and it definitely has a lot of the same elements. And it reminded me that, although I don't generally like traditional mysteries, I do very much enjoy a police procedural, especially when it's heavy on the details of how the investigation works.