| Business | Phone |
| A Scott Smith Investigate 746 Dumont Dr, Richardson 75080 | (972) 680-0010 |
| Dale Simpson & Assoc 1144 N Plano Rd 136, Richardson 75081 | (972) 680-8200 |
| Executive Services Invstgtn 14 Canyon Creek Vlg, Richardson 75080 | (972) 235-4877 |
| Ias Investigations 1485 Richardson Dr 100, Richardson 75080 | (972) 669-8323 |
| Investigative Research Assoc Po Box 832947, Richardson 75083 | (972) 889-3333 |