| Clue | Source | Date |
|---|---|---|
| Digital identifiers | New York Times | 20 Nov 2020 |
| 'CSI' IDs | The Washington Post | 03 Oct 2019 |
| "CSI" IDs | LA Times Daily | 03 Oct 2019 |
| "CSI" IDs | ||
| Expired IDs? | New York Times | 04 Nov 2018 |
| Expired IDs? | ||
| IDs tied to one digit | New York Times | 14 Jul 2017 |
| IDs tied to one digit | ||
| "CSI" IDs |