| Business | Phone |
| Ac1 Investigations 906 Memorial Pkwy Nw, Huntsville 35801 | (256) 533-4449 |
| Alabama Investigations 200 Randolph Ave Se, Huntsville 35801 | (256) 536-6444 |
| Alfacts Agency Investigations 7501 Memorial Pkwy Sw, Huntsville 35802 | (256) 883-9470 |
| Glenn Brooks & Assoc 100 Jefferson St S # 100, Huntsville 35801 | (256) 539-4172 |
| Investigative Services 1019 Old Monrovia Rd Nw, Huntsville 35806 | (256) 721-6962 |
| Metro Investigations Inc 906 Memorial Pkwy Nw, Huntsville 35801 | (256) 533-6404 |
| Metro Spy Supply 906 Memorial Pkwy Nw, Huntsville 35801 | (256) 533-9923 |