| Item | Count | Percent |
| Total | 15 | 100.0 |
| Weak or insufficient admissible evidence | 5 | 33.3 |
| Suspect being prosecuted on other charges (e.g., UFAPs) | 4 | 26.7 |
| Suspect to be prosecuted by other authorities | 3 | 20.0 |
| No federal offense evident | 2 | 13.3 |
| Lack of evidence of criminal intent | 1 | 6.7 |