| Item | Count | Percent |
| Total | 47 | 100.0 |
| Weak or insufficient admissible evidence | 19 | 40.4 |
| Suspect to be prosecuted by other authorities | 17 | 36.2 |
| Lack of evidence of criminal intent | 3 | 6.4 |
| Suspect being prosecuted on other charges (e.g., UFAPs) | 3 | 6.4 |
| No federal offense evident | 2 | 4.3 |
| Agency request | 1 | 2.1 |
| All other | 2 | 4.3 |