| Business | Phone |
| Absolute Detective & Bodyguard 601 S 1st Ave # 101, Sioux Falls 57104 | (605) 334-2043 |
| Action Investigations Sioux Falls 57103 | (605) 321-4937 |
| Technical Investigative Svc 3801 S Kiwanis Ave # 1, Sioux Falls 57105 | (605) 335-6800 |
| Starr Enterprises Inc 141 N Main Ave # 305, Sioux Falls 57104 | (605) 336-1365 |
| Lewis Dirks 1809 S Remington Cir, Sioux Falls 57106 | (605) 331-6022 |