| Item | Count | Percent |
| Total | 54 | 100.0 |
| Weak or insufficient admissible evidence | 12 | 22.2 |
| No federal offense evident | 10 | 18.5 |
| Suspect being prosecuted on other charges (e.g., UFAPs) | 8 | 14.8 |
| Lack of evidence of criminal intent | 6 | 11.1 |
| Lack of investigative or prosecutive resources | 3 | 5.6 |
| Agency request | 2 | 3.7 |
| Suspect to be prosecuted by other authorities | 1 | 1.9 |
| All other | 12 | 22.2 |