| Item | Count | Percent |
| Total | 88 | 100.0 |
| Weak or insufficient admissible evidence | 32 | 36.4 |
| Suspect to be prosecuted by other authorities | 26 | 29.5 |
| Suspect being prosecuted on other charges (e.g., UFAPs) | 11 | 12.5 |
| No federal offense evident | 9 | 10.2 |
| Lack of evidence of criminal intent | 3 | 3.4 |
| Lack of investigative or prosecutive resources | 3 | 3.4 |
| Agency request | 1 | 1.1 |
| All other | 3 | 3.4 |