| Item | Count | Percent |
| Total | 22 | 100.0 |
| Weak or insufficient admissible evidence | 10 | 45.5 |
| Suspect being prosecuted on other charges (e.g., UFAPs) | 4 | 18.2 |
| Suspect to be prosecuted by other authorities | 3 | 13.6 |
| Agency request | 2 | 9.1 |
| No federal offense evident | 1 | 4.5 |
| All other | 2 | 9.1 |