# Sentinel® Offender Services

> Sentinel Offender Services combines GPS and radio-frequency monitoring, alcohol testing, case management software and staffed supervision services for U.S. courts and corrections agencies. Founded in 1993 by Robert Contestabile, the Anaheim company became part of Allied Universal in July 2026.

- **Founded:** 1993
- **Headquarters:** Anaheim, United States
- **Founders:** Robert Contestabile (Founder)
- **Products:** SentinelDNA, OM500, RF Patrol, Alcohol monitoring, National Monitoring Center
- **Notable:** Operating since 1993., Acquired G4S Justice Services with Bison Capital backing in 2012., Completed the Omnilink acquisition announced April 18, 2022; seller disclosed $37.6 million cash consideration.

## Products & services

- **SentinelDNA** — Web-based supervision platform combining dashboards, case records, payments, drug test records, inventory and location analytics.
- **OM500** — Ankle-worn tracking device using GPS, Wi-Fi and cellular location technologies, with tamper detection and participant messaging.
- **RF Patrol** — Radio-frequency home confinement and curfew monitoring.
- **Alcohol monitoring** — Remote breath testing and SCRAM continuous transdermal alcohol monitoring offerings.
- **National Monitoring Center** — 24/7/365 alert review, agency notification, technical support and participant record assistance.
- **Day reporting centers** — Community supervision programs incorporating cognitive skills, employment preparation and support services.
- **Mobile applications** — SentinelDNA Mobile, FocalPoint Mobile and Advocate app offerings for supervision and victim notification.

## Achievements

- Operating since 1993.
- Acquired G4S Justice Services with Bison Capital backing in 2012.
- Completed the Omnilink acquisition announced April 18, 2022; seller disclosed $37.6 million cash consideration.
- OM500 appeared on South Carolina’s June 23, 2025 approved electronic monitoring device list.
- Acquired by Allied Universal in July 2026.

## Latest updates

- **2026-09** — Allied Universal’s acquisitions roundup lists July 2, 2026 as Sentinel’s transaction close date.
- **2026-07** — Allied Universal announced the acquisition on July 6; financial terms were not disclosed.
- **2025-08** — Sedgwick County procurement minutes record Sentinel’s electronic monitoring proposal and selection of Greenfeather Monitoring.

## Links

- Website: https://sentineladvantage.com/
- LinkedIn: https://www.linkedin.com/company/sentinel-offender-services-llc/
- YouTube: https://www.youtube.com/channel/UCOq7VxpXulvSZHJd6Orbfxw
- Facebook: https://facebook.com/pages/Sentinel-Offender-Services-LLC/352566071468305

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Published by YesPress — https://yespress.io
Last updated: 2026-10-25