| Business | Phone |
| Perez Investigations Inc Po Box 1764, Martinez 94553 | (925) 934-5543 |
| Covert Outfitters 421 N Buchanan Cir, Martinez 94553 | (925) 625-6979 |
| Infinity 8 Investigations 825 Ferry St, Martinez 94553 | (925) 228-5788 |
| Merle Thompson Investigations 100 Gordon Way, Martinez 94553 | (925) 228-0261 |
| R Patterson Investigations 1350 Arnold Dr, Martinez 94553 | (925) 250-7298 |
| Selective Screening Systems Po Box 1667, Martinez 94553 | (925) 372-5958 |