| Business | Phone |
| Adcox Railroad Consulting Oper 10991 Timber Creek Dr, Tyler 75707 | (903) 566-4303 |
| Dennis Investigations 1617 Golden Rd, Tyler 75701 | (903) 592-6900 |
| Lew Tex Investigation 306 Stanford St, Tyler 75701 | (903) 258-9677 |
| A-Action Investigation Svc 207 E Elm St, Tyler 75702 | (903) 596-8170 |
| Statewide Services 310 S Fannin Ave, Tyler 75702 | (903) 597-1800 |