| Business | Phone |
| Confidential Polygraph Svc 1730 S 13th St, Omaha 68108 | (402) 345-4414 |
| Professional Investigations Po Box 27303, Omaha 68127 | (402) 690-4014 |
| Heartland Investigations Inc Omaha 68127 | (402) 331-7335 |
| Detective Svc 11929 Elm St 17d, Omaha 68144 | (402) 333-3303 |
| Private Polygraph Svc Inc 11929 Elm St, Omaha 68144 | (402) 333-5437 |