| Investigative Resources International | nationwide | 800-252-5853 |
 |
| Lakeside Investigations, P.C. | *Statewide*, IL | 800/636-1511 |
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| Verdict Resources, Inc. | nationwide | 888-800-8895 |
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| Confidential Affairs Investigative Agcy, Inc. | IN, IL, MI | 219-985-1605 |
|
| Middleton Investigative Services | nationwide | 866-647-8091 |
|
| Investigation and Paralegal Group | nationwide | 314-642-6000 |
|
| Chicagoland Detective Services, Inc. | IL, WI, IN | (312) 661-0702 |
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| Smith Investigations, Inc. | Danville, IL | 217-446-5373 |
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| Metro Detective Agency | Dekalb, IL | 815-757-8940 |
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| Gietzen & Associates, Inc. | nationwide | 888-779-2345
813-223-3233 |
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| IPSA Intenational, Inc. | nationwide | (510)748-1234 |
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| L.S.S. Consulting Inc. Legal and Security Strategics | nationwide | 248-366-5020 |
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| Five Star Detective Agency, Inc. | *Statewide*, IL | (630 or 847) 774-1000 |
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| CDS Group International LLC | nationwide | 402-462-9966 |
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| Kalmbach and Associates | nationwide | 888-540-0601 |
|
| Tri-County Private Investigations of Missouri | nationwide | 816-407-1213 |
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| Mort Smith, Private Investigator | Broadview, IL |
| Counselors Investigations | Chicago, IL |
| Accord Detective Agency, Inc. | Park Ridge, IL |
