PRIVATE INVESTIGATORS
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  • Customer Reviews
  • investigative-articles
  • GPS Tracking

Mark Matthews & Associates, LLC
Since 1977

Spearfish Private Investigators
Spearfish, SD - Lawrence County
(605) 231-8393
Timely. Thorough. Discreet
Click Here To Speak With A Spearfish Private Investigator

 ​Put 40 years of investigative experience to work for you.  Mark Matthews began his career as an investigator in 1977, while
​working for a family owned detective agency. He's handled investigations across the United States and in Washington, D.C., for a
variety of clients including Fortune 500 companies such as General Motors, Dow Chemical and State Farm Insurance.


From start to finish, you'll be keep apprised of developments in a discreet, confidential manner. Whatever
you ​have questions about;  Social Media Trace, ​Locating People, Child Custody, 
​Affairs of the Heart, Infidelity Surveillance, ​Cohabitation Verification, 
Digital Forensics, Wrongful Death Actions, 
Hard Service Subpoenas, Infidelity Investigation, Fraud Investigation, Cold Case Review, ​​Identity Verification,  ​Asset Recovery
or a Missing Persons Investigation, we have the knowledge and ​determination to get the information you deserve.
​​​
With hundreds of cases solved over the course of business as South Dakota Private Detectives, it's second nature to us ​in finding answers to even the most complex cases.  Even if your investigation involves your  Lawrence County Sheriff's Department, Spearfish Police Department or is a case filed in the South Dakota District Court. 

Our associate investigators are located throughout the United States and the The Great Plains, so whether your investigation is local or regional, we can accomplish your case in a proficient manner.
​

​​Let us help solve your case!
 
 
Missing Persons - Social Media Traces - Accident Investigation
Comprehensive Backgrounds - C
ustody Matters - Cohabitation Verification    
Asset Recovery - 
Hard Service Subpoenas - Heir-ship Clarification - Wrongful Death
Identity Verification - Finding Biological Parents - Genealogy - Complex Case Review

  
Call for a free consultation on how to​ solve your particular issue.


(605) 231-8393

Click Here For A Free Telephone Consultation​
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