| Business | Phone |
| Waller & Assoc Llc 12555 W Burleigh Rd, Brookfield 53005 | (262) 782-5515 |
| Rizzardi Investigations 18600 Brookfield Lake Dr 54, Brookfield 53045 | (262) 782-9600 |
| Proulx Professional Research 12555 W Burleigh Rd, Brookfield 53005 | (262) 784-4300 |
| Rapid Results Investigations 400 Green Meadow Dr, Brookfield 53045 | (262) 893-5772 |
| Isi 2970 N Brookfield Rd, Brookfield 53045 | (262) 797-6190 |