| Item | Count | Percent |
| Total | 40 | 100.0 |
| Weak or insufficient admissible evidence | 12 | 30.0 |
| No federal offense evident | 11 | 27.5 |
| Lack of evidence of criminal intent | 10 | 25.0 |
| Agency request | 2 | 5.0 |
| Suspect being prosecuted on other charges (e.g., UFAPs) | 2 | 5.0 |
| All other | 3 | 7.5 |