With over 30 years of trusted service and celebrating
our 28th year as Viper Detective Agency Ltd.,
The staff at Viper has been proud to serve your investigation                   SEE MONTHLY UPDATE FOR THE MOST UPDATED INFORMATION.
and process serving needs with total
confidentiality, professionalism and respect.

                                                                                                PLEASE NOTE:   WE ARE NO LONGER ACCEPTING NEW WORK or CLIENTS

                                                                                     AS THE OWNER, SALLY ENGSTROM HAS BEEN PUT ON A MANDATORY MEDICAL LEAVE

                                                                                     DUE TO TRANSPLANT.

                                                                                                                                                                     

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/Owner

Monthly Update


It saddens me to update you with the news of my mandatory medical leave.  To provide an update, its mandatory for me to take time away from work. I had the transplant operation on  February 22, 2024, I came into the hospital on February 21, 2024, day before, That being said the lung transplant team was amazing at Northwestern Memorial Hospital in Chicago, Illinois.

I'm thankful for the cards sent to me after surgery, it meant a lot to know everyone cares.  I am improving everyday and hopefully stronger and wiser. 

Another update: In February this year 2025 I had returned to the hospital for a rather large 1.1 centimeter kidney stone stuck on my kidney to be removed by Laser and then again on my anniversary the 22nd came back for coronavirus with fever for 5 days.  So it seems other organs can't take the strong antirejection medications so it's a wait and see, I'm lucky, the first year is the hardest hurdle.  Today is  April 9, 2025, I keep trying to gain more momentum physically and mentally.

My caretakers, are my three daughters and son, ages 24-39, so no, not babies.  All the girls are living with me and take turns taking care.. The caretakers are required to set up a charity account and my youngest went with GoFundMe since only our caretaker could do this, the medical expenses are not all covered, extremely expensive. 

First, I want to thank anyone who has donated funds to this campaign. My youngest daughter, Bri McAloon created the campaign and took over paying bills, etc. 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.  I'm just so proud of all four (4) of my kids..

Click here to see our old Ad. I know 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.