• Association of Certified Fraud Examiners (ACFE) Milwaukee Chapter #165
  • Fox Valley Adjusters Association (FVAA)
  • International Association of Insurance Professionals (IAIP)
    • Kettle Moraine Insurance Professionals (KMIP)
  • Milwaukee Insurance Adjusters Association (MIAA)
  • Professional Association of Wisconsin Licensed Investigators (PAWLI)
  • United Council of Welfare Fraud (UCOWF)
  • Wisconsin Association of Public Assistance Fraud (WAPAF)
  • Women Business Owners Network | Wisconsin Women Entrepreneurs (WBON | WWE)



Interstate Reporting Co., Inc.

Here at Interstate Reporting Co., Inc., we are dedicated to you and all your different investigative needs.

Our team is dedicated to uncovering the truth. We have served Wisconsin and the nation for 30 years, and we can customize any investigation to suit your needs. Contact us today for a free confidential, no obligation consultation by telephone or e-mail.

ph: (262) 251-6590 | tf: (800) 993-2375 | fx: (262) 251-0929


Jennifer Tremaine, CWFI, CSI

VP | Investigations Director

As the Investigations Director, Jennifer leads the team in our S.I.U. Department. In 2011, Jennifer became a minority shareholder of Interstate Reporting Co., Inc.

Jennifer is a valuable asset to the risk assessment team, thanks to her expertise as a Certified Welfare Fraud Investigator (CWFI) and as a Certified Surveillance Investigator (CSI). She has also completed the Reid Technique Interviewing and Interrogation. Continuing her education and directing our team of investigators, keeps our staff as efficient and productive as possible.

Jennifer manages all new case assignments, schedules the investigative staff, helps her team develop pertinent leads, and reviews reports for accuracy and quality. She understands the importance of meeting deadlines and works closely with our clients to evaluate each assignment and offer appropriate solutions that meet budgetary and time constraints. 

Sandra "Sandy" Leonhard, CWFI, CFE


Sandy has over 19 years of experience as a private investigator with Interstate Reporting Co., Inc. Sandy purchased the company in 1997. Interstate Reporting Co., Inc. has been WBE (Woman-Owned Business Enterprise) certified since 2011.

Sandy is a Certified Welfare Fraud Investigator (CWFI), as well as a Certified Fraud Examiner (CFE). Her unique set of skills investigating fraud, waste and abuse, as well as her knowledge of difficult financial transactions, combine for a complete approach to tackle your allegations of fraud.

Sandy works very closely with our Investigations Director and staff to provide thorough investigations in a timely manner. In addition, she oversees our daily operations and supervises customer relations, marketing, and accounting. She leads the way in developing the new services we are adding at Interstate Reporting Co., Inc.