| Business | Phone |
| Axciton Systems Inc 2825 Wilcrest Dr 618, Houston 77042 | (713) 789-8245 |
| Texas Polygraph Consultants 9801 Westheimer Rd 302, Houston 77042 | (713) 917-6704 |
| Boyd Smith & Assoc 9001 Airport Blvd 607, Houston 77061 | (713) 943-2698 |
| Bradley & Assoc 4910 Dacoma St 400, Houston 77092 | (713) 956-7118 |
| Ernie Hulsey & Assoc 7474 S Kirkwood Rd # 205, Houston 77072 | (281) 561-7701 |
| John Swartz Polygraph Svc 11767 Katy Fwy, Houston 77079 | (713) 460-3000 |