| Business | Phone |
| Adherence Investigations Danville 94526 | (925) 324-1234 |
| Blb Gear Danville 94506 | (925) 964-0986 |
| Dane Investigations Danville 94526 | (925) 314-9521 |
| Danville Investigations Danville 94526 | (925) 831-8696 |
| Diablo Investigations Po Box 744, Danville 94526 | (925) 820-2524 |
| Fire Triangle Investigations Danville 94526 | (925) 855-1135 |