Private InvestigatION Services

Sentry Data Systems services include comprehensive investigations using cutting-edge resources to meet your business or personal needs.  Sentry Data Systems is privately-owned and operated by an experienced law enforcement professional.  Our goal is to provide you with the investigative services you need and with the best forensic computer service available - all at an affordable price!   We are dedicated to getting you results you can trust. 

Sentry Data Services Private Investigation Can Help YOU With:

  • Investigations for prosecution or criminal defense
  • Background checks, both pre-employment checks and investigations of current employees
  • Financial investigations for individuals, small businesses and corporations
  • Interviews and witness statements
  • Business intelligence and surveillance including "stealth" examinations of computers.
  • Insurance investigations
  • General information services
  • Locating missing persons
  • Investigations into domestic, family, marriage and probate issues
  • Serving of legal documents
  • Corporate training

Prosecution and Criminal Defense Investigation

Criminal Prosecutors and Defense Attorneys need investigators to provide professional criminal investigation to support advocacy of the client and to protect constitutional rights. We support the rights of the victim as well as the rights of the accused. With comprehensive factual investigation SDS helps to assure due process and that justice is achieved. With specialties in computer forensics and years of investigative experience SDS can be an integral part of the legal process providing the necessary support for successful case results.

Backgrounds, Financial and Asset Investigation

Using up-to-date hardware and software SDS provides comprehensive backgrounds of individuals including their financial worth and list of assets that can be determined by utilizing the most modern informational data bases available and well as field inquiries.

Corporate Investigation

Corporate investigations such as employee dishonesty, embezzlement, sexual harassment, employee screening, drug use, and other types of investigations can be conducted upon request. Proper investigation of White collar crime and computer criminal activities can save companies but can cost untold thousands and more dollars if left unresolved.  SDS can also provide forensic images of company hard drives protecting against spoliation (the destruction, alteration, or mutilation of evidence that may pertain to legal action) allowing the company to run as usual without fear of violating court orders. If one email is deleted or one word changed, one could be guilty of spoliation.  Preservation of evidence is crucial for either the accused or accuser that could potentially result in losing, or winning a case.

Statements and Interviews

Interviewing and obtaining recorded or signed written statements from witnesses, claimants, insured, subjects, and other individuals. Statements and Interviews can be pivotal in criminal cases or when making significant corporate decisions.  Coverage includes eyewitness accounts, liability questions, insurance coverage issues, reputation, character testimony, general information, and employer statements.

Surveillance and Intelligence

Few investigators can conduct a successful physical surveillance. SDS uses up to date technology.  Our investigators have had specialized training in surveillance investigation and provide outstanding observation and documentation necessary for a successful conclusion.  SDS investigators are low key and discreet. Many clients with insurance, divorce, child custody, theft, and infidelity issues have resolved their problems before any court proceedings, due to successful surveillance provided by SDS.

Insurance Defense Investigation

Claims adjusters, supervisors, and managers can benefit from our claims investigation to determine legitimate losses and combat fraud. SDS provides coverage for, liability, damage, insurance litigation investigation with our customers’ needs in mind. We maintain the integrity of handling the claims process without forgetting the needs of our client.

Information Services

Sentry Data Systems provides personal and public information on individuals, businesses, and corporations which provides a wealth of knowledge and information in order to support key decisions. Criminal records are available nationwide.

Missing Persons and Location Services

SDS investigators are experienced in locating missing persons.  It is not easy finding people who are either missing or cannot be easily found because someone has lost track of them over time. SDS can help you locate and make contact with the people you want to find.

Domestic/Family/Infidelity/Probate Matters

SDS investigators are experienced in gathering the necessary information that could affect divorce and custodial issues.  If your spouse is cheating or if there are concerns on custodial safety SDS can answer these important questions.  Regardless if questioning fidelity prior to marriage or after marriage, the cost of a wrong decision can be devastating.  If you have concerns if your children should have visitation rights our investigators can answer those tough questions and relieve any doubts that you may have or help you avoid devastating consequences later.



Founder and Owner, Sentry Data Systems

SUMMARY Michigan Licensed Private Detective (ID# 3701205236)

 Forensic Computer Examiner with extensive training, credentials, and experience in civil and criminal forensics investigations. Provide a myriad of services including:

  • Computer Forensics Digital Data Forensics Electronic Evidence Discovery
  • Corporate Training Services
  • Provide customized services to a broad clientele in the application of computer investigation and analysis. Extensively experienced law enforcement specialist with diverse experience at the local, state, and federal levels including service and training with the United States Secret Service, Federal Bureau of Investigation, and the Internal Revenue Service.


Computer Software and Operating Systems

  • ENCASE, Guidance Software, Inc.
  • Forensic Software
  • All Windows Operating Systems
  • All MAC Operating Systems
  • iPhone, iPad and i

Computer Forensics Processes

  • Data Imaging, Verification, and Search
  • Retrieval of Deleted, Encrypted, password protected and Hidden Data
  • Expert Investigative Techniques
  • Evidence Collection and Protection
  • Equipment Seizure Procedures

PROFESSIONAL HISTORY of Inv. L. "Jake" Jacobsen

1999 – Present
Consultant / Founder, Sentry Data Systems, LLC
Established this private consulting firm providing computer forensic investigative services to:

Defense attorneys, corporations, individuals, insurance companies, criminal prosecutors, civil litigators, and others. Extensively trained in collecting and protecting potential evidence, imaging and evaluating computer content. Utilize state-of-the-art systems and techniques in all activity.

Deputy Sheriff Washtenaw County, MI.
Assigned to road patrol duties as well as K-9 handler for bomb detection.  Assisted US Secret Service with Presidential Security.

Deputy / Narcotics Investigator / Computer Crimes Investigator, Leelanau County Sheriff’s Office, Leland, MI
Serve as the key law enforcement officer in conducting and managing all computer forensic

investigations within the county and as a liaison with other law enforcement officers/agencies.

Served as detective with the Michigan State Police Drug Concept Team, participated in undercover narcotics assignments as well as computer forensic analysis investigations.

As a Deputy with the department, performed a full spectrum of law enforcement services; i.e., road patrol, vehicle and aircraft accident investigations, court testimony in both criminal and civil cases. Investigated homicides, robberies, rapes, domestic assaults, extortions, and numerous other crimes throughout my career.

On request of Michigan’s Attorney General office, assisted other law enforcement agencies in computer forensic investigations.

Assisted several federal agencies, including the Federal bureau of Investigations (FBI), U.S. Immigration and Customs Enforcement (ICE) and the U.S. Coast Guard with computer forensic investigations.

Assisted numerous Michigan State Police posts in northern Michigan with computer forensic examinations.



  • A+ Certification - Computing Technology Industry Association
  • Certified Electronic Evidence Collection Specialist-EECS, IACIS - Orlando, FL


  • Washtenaw County Police Academy Graduate - Ann Arbor, MI
  • Encase basic computer forensic training - Toronto, Canada
  • Basic computer forensic training, National White Collar Crime Center – Fairmont, WV
  • Advanced computer forensic training – NWCCC - Fairmont, WV
  • Advanced computer forensic training - IACIS Orlando, FL
  • Advanced computer forensic training - Guidance Software - Pasadena, CA
  • Advanced computer forensic training - Guidance Software Houston, TX



  • High Technology Crime Investigation Association (HTCIA) [Past Member]
  • International Association Computer Investigative Specialists (IACIS)
  • High-Tech Crime Network [Past Member]
  • National Technical Investigators Association [Past Member]



  • Michigan Licensed Private Detective
  • FAA Licensed Pilot, Commercial/Instrument Rated


Professional references are available.

Sentry Data accepts all major credit cards!

Phone (231) 256-9156
FAX (231) 256-9156

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