GET IN TOUCH WITH A POLYGRAPH EXPERT Do not take a Lie Detector Test without calling us first. You will be glad you did!Experience the Best Polygraph Service in Minnesota. … Call for availability Limited evening and weekend appointments available for additional fee Remember… Do not take a polygraph without calling the Polygraph Experts first. Tel: (507) 519-0503 | Email: erica@integritypoly.com 209 South 2nd Street, Suite 300Mankato, MN Name Email Subject Message Send If you are ready to make a polygraph appointment Click Here to go to our Appointment page.To go back to the home page Click Here.