(Co-authored with Jess Zhang and Ari Kotler for the Vera Institute.)

Electronic monitoring (EM) is a form of digital surveillance that tracks people’s physical location, movement, or other markers of behavior (such as blood alcohol level). It is commonly used in the criminal legal system as a condition of pretrial release or post-conviction supervision—including during probation, parole, home confinement, or work release. The United States also uses electronic monitoring for people in civil immigration proceedings who are facing deportation.

This report fills a gap in understanding around the size and scope of EM use in the United States. The Vera Institute of Justice’s (Vera) estimates reveal that, in 2021, 254,700 adults were under some form of EM. Of these, 150,700 people were subjected to EM by the criminal legal system and 103,900 by U.S. Immigration and Customs Enforcement (ICE). Further investigation revealed that the number of adults placed on EM by ICE more than tripled between 2021 and 2022, increasing to 360,000. This means that the total number of adults on EM across both the civil immigration and criminal legal systems likely increased to nearly half a million during that time.

For more information, read the report.