​​650 NE Holladay St. Suite 1600
Portland, OR 97232
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E-mail: cornerstoneisinc@gmail.com
US: +1 (503) 349-0921
OR-PI #69507
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Our investigators have decades of investigative experience in both the public and private sectors, conducting methodical inquiries to properly collect and document all available information and evidence in support of those who require such information. Whether individuals, corporations, law firms, or insurance companies, our clients are all treated with the same attention to detail, integrity, and thoroughness, regardless of the complexity of the case. Every case is unique, therefore, every investigation is tailored to maximize the effectiveness of the investigator, with the goal of successfully meeting case objectives on behalf of the client. 
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Professional Private Investigators

Cornerstone Investigative Services, Inc investigators are licensed by the State of Oregon. We take pride in helping people find information and answers to their questions. Our priority is to meet the objectives set for us by our clients.

Surveillance

Cornerstone's investigators are highly proficient at conducting legal surveillance. If a situation dictates the need for surveillance, every effort is made during pre-operational planning to gather as much pertinent information from the client as possible to enable our field investigators to be efficient and effective. Our investigators are well equipped, with HD video cameras, long-range still cameras and a variety of covert cameras. They use the right photographic equipment at the right time, with date and time stamp capability. 

Surveillance services are routinely provided for:

  • Infidelity investigations
  • Insurance claim investigations
  • Workers Compensation claims
  • Child custody investigations
  • Corporate/No-compete investigations
  • Person locate verifications
  • Activity/Welfare checks
     

Locates
Locate services are provided to locate individuals for a variety of reasons, from simple locates for the service of process to more complex cases, such as missing persons, or lost relatives. We have access to premiere database and information systems, which we use to enhance the investigative process and increase our ability to succeed on behalf of our clients. In some instances, it is necessary to confirm our database research with field verification.  

Locate services are routinely provided for:

  • Process service
  • Welfare checks
  • Skip tracing
  • Lost relatives
  • Judgement resolution


We offer an array of online research and field investigative services. In many instances these services overlap to provide the most comprehensive investigative solutions possible, and to ensure that our field investigations are based on the most current intelligence and best information available. We utilize premiere database and information systems to enhance the investigative process and increase our ability to succeed on behalf of our clients.

General Investigations
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  • Surveillance
  • Infidelity investigations
  • Child custody investigations
  • ‘Misplaced’ relative locates
  • Adoption investigations

  • Surveillance
  • Airport arrivals and departures
  • Review ‘red-flag’ information the client may not realize they possess, such as phone records
  • Identification of the other party
  • Coordinated with the client’s legal representative, if any

  • Surveillance
  • Investigation of ‘No-Compete’ clause violations
  • Business asset research
  • Due diligence investigations
  • Employee background checks
  • Business background checks

Infidelity Investigations

Family/Domestic Investigations

  • Coordinated with the client’s legal representative, if any
  • Scene investigation and documentation
  • Police report review
  • Evidence examination
  • Witness locates
  • Witness interviews
  • Courtroom testimony
  • Report writing

Background Investigations

Criminal Defense Investigations

Corporate Investigations

  • Employees
  • Care providers
  • Social media research
  • Criminal record checks
  • Public record checks
  • Court record checks
NEW SERVICE 
​Internet Investigations

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With hundreds of social media platforms to choose from, determining the extent of someone's internet presence can be challenging. We employ up-to-date tools to conduct open-source (OSINT) and social media (SOCMINT) research in all our investigations to some extent, depending on the nature of the investigation. No investigation is complete without it. Internet investigation is always informative for,  
  • Web presence research
  • Internet exposure research
  • Privacy issues
  • Person locates
  • Background investigations
  • Surveillance
  • Insurance claim investigation
  • ...and more!