| Business | Phone |
| K & W Laboratories 9331 Albemarle Rd # B, Charlotte 28227 | (704) 569-1800 |
| On Spec Testing 5405 Wilkinson Blvd, Charlotte 28208 | (704) 392-8472 |
| Test America 2848 S Interstate 85 Svc Rd #B, Charlotte 28208 | (704) 392-1164 |
| Stork-Herron Testing Labs Inc 1200 Westinghouse Blvd # A, Charlotte 28273 | (704) 588-1131 |
| Prism Laboratories Inc 449 Springbrook Rd, Charlotte 28217 | (704) 529-6364 |
| Chem-Bac Laboratories 2500 West Blvd # A, Charlotte 28208 | (704) 394-6381 |
| Csa Intl 5970 Fairview Rd # 722, Charlotte 28210 | (704) 552-5125 |
| Froehling & Robertson Inc 2505 Hutchinson Mcdonald Rd, Charlotte 28269 | (704) 596-2889 |
| All In One Drug Testing Services P.O. Box 42984, Charlotte 28202 | (704) 969-5471 |