| Item | Count | Percent |
| Total | 40 | 100.0 |
| Lack of evidence of criminal intent | 13 | 32.5 |
| No federal offense evident | 13 | 32.5 |
| Weak or insufficient admissible evidence | 5 | 12.5 |
| Suspect to be prosecuted by other authorities | 4 | 10.0 |
| Agency request | 1 | 2.5 |
| Suspect being prosecuted on other charges (e.g., UFAPs) | 1 | 2.5 |
| All other | 3 | 7.5 |