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With over 28 years of trusted service and celebrating
our 24th year as Viper Detective Agency Ltd.,
The staff at Viper has been proud to serve your investigation
and process serving needs with total
confidentiality, professionalism and respect.

PLEASE NOTE:  WE ARE NO LONGER ACCEPTING NEW CLIENTS, AS THE PRESIDENT/ OWNER HAS BEEN PUT ON A MANDATORY MEDICAL LEAVE.

SEE MONTHLY UPDATE FOR RECENT INFORMATION.

Viper Detective Agency, Ltd., is an Illinois based, female owned, licensed Detective Agency.
We are competitive, experienced, and professional. We are staffed
with Licensed Investigators, Certified Paralegals and Notaries.
Hopefully to Reopen daily and to work diligently.


We had offered a wide variety of services:

  • Surveillance - video and/or camera evidenced report.
  • Interviews - recorded and non-recorded statements taken.
  • Investigations - criminal & civil
  • Background Checks
  • GPS Real Time automobile tracking systems
  • Nationwide Skip Trace Investigations
  • Nationwide Process Serving
  • Cheaters - Confirm their story, and more.


State of Illinois
Class A Private Detective: 115-001692

State of Illinois
Class A Private Detective Agency: 117-001164

 


Sally L. Engstrom
President

Monthly Update


It saddens me to update you with the news of my mandatory medical leave.  I will sign off to be put on the double lung transplant list on Monday, February 19, 2024, here in Chicago.

I'm thankful that we were able to help so many families find love, peace and growth with a successful surveillance/investigation. As a mother of four, I truly appreciate all the letters, pictures and cards over the years. It always lifts my spirits to know that my Agency has helped so many families.

It's time for my family to take care of me in a time of need.

It is with extreme heartbreak that I have to end my career this way, however it's been a very long  time and hope to tell that story while I recover. My youngest daughter, Bri McAloon created a campaign to help support this transition, and she explains our story quite eloquently. If you have a chance, please take a look if you want to know more detail. She will be updating the site with my progress, click here to see the campaign.

Lastly, I can't delete the Ad picture linked below, we've had it way too long on this site, and we will keep it as a reminder of the fun we have had along the way.

Click here to see our Ad. Since many of you have asked, this is the Ad from Judges' Nite displayed in their playbill in DuPage County, Wheaton, Illinois. We had a lot of fun with this.