Protecting consumer rights and increasing public safety.























APEC Investigations
Contact Person: AJ
2019 W. 102nd Ave
Thornton, CO 80260
Phone: 310-614-2321
APEC Investigations, LLC is a Colorado business providing professional private investigations including surveillance, background checks, skip tracing, process serving, and notary public services to a wide range of clients.  We serve individuals, attorneys, healthcare providers, bounty hunters, and companies of any size through investigative and human resource support services.  We are a licensed and bonded company located north of Denver with a team of dedicated professionals.


Civil & Criminal Services LLC

Roman Herrera

Tel: (720) 616-8139



We are the first-rate Private Investigation and Process Service firm servicing the Denver Colorado Metropolitan area.  We specialize in Criminal Investigations, Personal Injury Investigations, Corporate Investigations and other legal support functions such as Process Serving, Skip Tracing, and Surveillance.  We also specialize in use of force and police procedures.

CSI Corporate Security and Investigations
William Hickman
5445 DTC Parkway, Penthouse 40
Greenwood Village, CO 80111
Tel: (866) 587-4274
Fax: (724) 775-3599
The hard-to-find investigative information that you need to win cases is out there.  CSI provides expert investigations that are accurate and affordable.  We give you the specialized expertise and depth of resources of a big firm, delivered through the personal and responsive relationship of a local partner.  CSI gets you the “facts to act.


Investigative Resources, Inc.
Complex Case Investigations
Anthony DiVirgilio
1625 Larimer Street Suite 1903
Denver, CO 80202
Tel: (303) 534-1177
Fax: 303-534-1590
Private investigators serving the legal and business community in Colorado since 1982. Providing civil, criminal defense, and corporate internal affairs investigations including witness interviews, nationwide backgrounds, asset searches, and immediate personal injury accident investigations. Member: Member: NALI / PPIAC / NACDL / CCDB

Kass Research Group
Jeff Kass
PO Box 7056
Denver, CO 80207
Tel: (303) 518-9905
A full-service investigative firm bringing 20 years of award-winning journalism experience to finding people and information.

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