| Business | Phone |
| Ashton Automotive Testing Inc 2100 Centerwood Dr, Warren 48091 | (586) 756-6500 |
| Detroit Testing Lab Inc 7111 E 11 Mile Rd, Warren 48092 | (586) 754-9044 |
| Pml Svc 32458 Dequindre Rd, Warren 48092 | (586) 264-8300 |
| Detroit Testing Laboratory Inc 7111 E 11 Mile Rd, Warren 48092 | (586) 754-9000 |