| Clue | Source | Date |
|---|---|---|
| Investigate persistently | New York Times | 21 Feb 2024 |
| Try to unearth | Newsday | 19 Dec 2023 |
| Probe | Wall Street Journal | 25 Jun 2022 |
| Try to expose | LA Times Daily | 15 Oct 2021 |
| Try to expose | The Washington Post | 15 Oct 2021 |
| Probe persistently | Jonesin | 26 Jan 2021 |
| Try to unearth | New York Times | 26 Oct 2020 |
| Probe | Universal | 23 Mar 2018 |
| Probe | Wall Street Journal | 03 Dec 2016 |
| Make cutting remarks about | LA Times Daily | 29 Aug 2015 |
| Probe persistently | Thomas Joseph | 15 Apr 2015 |
| Make cutting remarks about | ||
| Probe | ||
| Try to unearth | ||
| Try to unearth | ||
| Probe persistently | ||
| Probe persistently | ||
| Use a shovel on | ||
| Probe |