| Item | Count | Percent |
| Total | 51 | 100.0 |
| No federal offense evident | 30 | 58.8 |
| Weak or insufficient admissible evidence | 13 | 25.5 |
| Suspect to be prosecuted by other authorities | 2 | 3.9 |
| Lack of evidence of criminal intent | 1 | 2.0 |
| Lack of investigative or prosecutive resources | 1 | 2.0 |
| All other | 4 | 7.8 |