| Business | Phone |
| Unified Testing Svc 525 Webb Industrial Dr B, Marietta 30062 | (770) 428-0444 |
| Dapss Lab Svc 2480 Windy Hill Rd Se 102, Marietta 30067 | (770) 980-1888 |
| Hygeia Laboratories Inc 1300 Williams Dr, Marietta 30066 | (770) 514-6933 |
| Psychemedics Corp 1229 Johnson Ferry Rd, Marietta 30068 | (770) 565-2323 |
| Applied Technical Svc Inc 1049 Triad Ct, Marietta 30062 | (770) 423-1400 |