| Clue | Source | Date |
|---|---|---|
| Zookeepers' rounds, informally | New York Times | 02 Jun 2018 |
| Zookeepers' rounds, informally | ||
| Sedates with a dart gun, slangily | USA Today | 25 Mar 2017 |
| Zookeeper's ammo, informally | Wall Street Journal | 01 Oct 2016 |
| Xanax and Valium, slangily | USA Today | 27 Sep 2016 |
| Xanax and Valium, slangily | ||
| Downers, in brief | ||
| Downers, slangily |