| Parrent Smith Investigation & Research | Los Angeles, CA | 310-275-8619 |
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| OmniTrace Corporation | nationwide | 888-965-6696 |
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| Marin Associates | San Rafael (San Francisco), CA | 415-454-4558 |
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| Workplace Criminalistics and Defense International | nationwide | 877-527-8706 or 713-353-3914 |
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| Southern Model Builders, LLC | nationwide | 251-625-2862 |
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| Verdict Resources, Inc. | nationwide | 888-800-8895 |
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| Gietzen & Associates, Inc. | nationwide | 888-779-2345 813-223-3233 |
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| David L. Warkentine-Private Investigator/Polygraph | Channel Islands Harbor, CA | 805-653-6626 |
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| Donofrio & Associates | San Francisco / Bay Area, CA | 800-997-7674 |
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| Gladding & Michel, Investigative Offices | Burlingame, CA | 650-692-1140 |
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| James J. Wedick & Associates | Gold River, CA | 916-638-3566 |
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| L.S.S. Consulting Inc. Legal and Security Strategics | nationwide | 248-366-5020 |
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| The Intelligence Group | nationwide | 908.901.0112 |
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| CDS Group International LLC | nationwide | 402-462-9966 |
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