Our Reliable Team
Over 30 Years of Combined Experience | Licensed Massage Therapist | 24-Hour Emergency Services
Over 30 Years of Combined ExperienceLicensed Massage Therapist24-Hour Emergency Services
Get to Know Our Staff
Read about the friendly faces you'll meet at the Great Falls Medical Services office. Come visit us or call to ask about our onsite and emergency services. Call us at (406) 868-7660 for emergency services.

Carmen Preston
Carmen Preston, a retired US navy personnel, has been with Great Falls Medical Services for over 15 years. In addition to her duties as a DOT certified Breath Alcohol and Urine Specimen Collection Technician, hair and DNA collection technician, Carmen commands the front desk and can answer questions about the business.

John Nelson
John Nelson has been with Great Falls Medical Services for over 610 years and has completed DOT certification as a Breath Alcohol and Urine Specimen Collection Technician. He is trained to do hair collections for drug detection as well as DNA collection for paternity and relationship testing. John is also proficient in completing physical exams for insurance companies, which includes biometrics, medical interviews and blood collection. He's a Master Beekeeper as well.

Terri Rogers
Terri Rogers has been Operations Manager for Great Falls Medical Services since 2009.
Certificates
- Phlebotomy Technician
- PBT(ASCP)cm
- Breath Alcohol Technician (BAT) and Factory Authorized Calibration Technician for Intoximeters, Inc Intoximeters Instructor for ALCO-SENSOR VXL / RBT VXL and ALCO-SENSOR IV w/MEMORY
- Urine specimen collection technician
- DNA collection technician
- DNA relationship testing consultant
Licenses
- State of Montana Licensed Massage Therapist (LIC – 457)

Jack Cantrell
Jack has been part of Great Falls Medical Services for over 7 years. He's a certified DOT drug collection, breath alcohol and audiometry technician. Jack is also a western artist who specializes in wildlife paintings. You can view some of Jack's work at cantrellwildlife.com.
