| Business | Phone |
| Affordable Investigative Svc 6714 Trowbridge Pl, Fort Washington 20744 | (301) 567-2083 |
| Big Dog Investigation & Rcvry 3012 Brodkin Ave, Fort Washington 20744 | (301) 248-0386 |
| Donaldson Investigations Ltd Fort Washington 20744 | (301) 292-7358 |
| Giannetti & Assoc 12934 Asbury Dr, Fort Washington 20744 | (301) 203-0151 |