When Ankle Monitors Are Constitutional Searches — Probation, Pretrial Release, and Article 14
GPS ankle monitors are a common condition of both pretrial release and probation in Massachusetts. For certain sex offenses, G.L. c. 265, § 47 directs that a defendant placed on probation “shall” be subject to global positioning system monitoring for the length of probation. Yet the Massachusetts Supreme Judicial Court has held that the automatic, blanket imposition of GPS monitoring is an unreasonable search under article 14 of the Massachusetts Declaration of Rights. An individualized determination of reasonableness is required.
This expanded guide explains how GPS devices work, when they are imposed, the constitutional framework established in Commonwealth v. Feliz and later cases, the practical burdens of wearing a monitor, and what defendants and their counsel can do to challenge or limit the condition.
What Is a GPS Monitoring Device?
A court-ordered GPS monitor is typically a one-piece ankle bracelet roughly two by three inches in size. It continuously records the wearer’s location through satellite signals and cellular networks and transmits that data to the Massachusetts Probation Service’s Electronic Monitoring (ELMO) program. The device cannot be removed by the wearer; charging is the wearer’s responsibility. Probation officers can program inclusion zones (places the person must be) and exclusion zones (places the person may not go). Alerts are generated for zone violations, low battery, or suspected tampering.
Thousands of people in Massachusetts are subject to electronic monitoring at any given time. Devices are imposed both as conditions of pretrial release and as conditions of probation after conviction.
When Can a Court Order GPS Monitoring?
Judges may order GPS monitoring at arraignment as a condition of release or after disposition as a condition of probation. For many sex offenses listed in G.L. c. 265, § 47, the statute directs that GPS monitoring “shall” be imposed for the length of probation. Other cases may involve GPS as a tailored condition to enforce stay-away orders, house arrest, or curfews. In practice, the device is usually installed before the person is released from custody; delays in equipment availability can result in additional days in jail.
GPS Monitoring as a Constitutional Search
In Grady v. North Carolina (2015), the United States Supreme Court held that the attachment of a GPS device constitutes a search under the Fourth Amendment. Massachusetts has gone further under article 14. In Commonwealth v. Feliz (2019), the Supreme Judicial Court held that the mandatory imposition of GPS monitoring on all qualifying sex-offense probationers, without an individualized determination of reasonableness, violates article 14.
The Court recognized that GPS monitoring is both a physical intrusion (the device strapped to the body) and a continuous surveillance of the wearer’s movements. It rejected a one-size-fits-all approach. Instead, a judge must weigh the government’s legitimate interests—public safety, enforcement of exclusion zones, deterrence, and rehabilitation—against the depth of the privacy intrusion in the particular case. Factors such as the defendant’s risk level, criminal history, the nature of the offense, and the availability of less intrusive alternatives are relevant.
Subsequent decisions have clarified that the duration of GPS monitoring is itself part of the reasonableness inquiry. A judge may not simply equate the length of probation with the length of GPS monitoring; the Commonwealth must justify the full period ordered. Courts have also addressed the imposition of GPS as a condition of pretrial release and the later retrieval of historical location data for investigative purposes.
Practical Burdens of Wearing a GPS Device
Beyond the constitutional analysis, the day-to-day experience of GPS monitoring is intrusive and often frustrating:
- The device must be charged regularly; failure to do so can generate alerts and potential violation proceedings;
- False alerts, signal loss, and connectivity problems are common and can require the wearer to take immediate steps to resolve them;
- Exclusion zones can limit access to work, family, medical care, or other necessary locations;
- House arrest or strict curfews can effectively confine the person to the home for large portions of the day; and
- The visible presence of the device can carry social stigma and practical difficulties in employment and daily life.
Challenging or Limiting GPS Monitoring
Because reasonableness is individualized, defense counsel can:
- Request a hearing on whether GPS is reasonable under the specific facts of the case;
- Present evidence of low risk, stable housing and employment, compliance history, and the availability of less restrictive conditions;
- Argue that the proposed duration is longer than necessary;
- Seek modification or termination of the condition if circumstances change during the probationary term; and
- In appropriate cases, move to suppress location data obtained from the device if the original imposition or later access was unconstitutional.
Frequently Asked Questions
Is GPS monitoring always required for sex-offense probation?
The statute says “shall,” but under Feliz and later cases the judge must still make an individualized determination that GPS monitoring (and its duration) is reasonable. A judge may impose a shorter period of monitoring than the full probation term, or in some cases none at all, if the Commonwealth cannot justify the intrusion.
Can police use my GPS data to investigate a new crime?
Courts have drawn distinctions between the initial imposition of the device and the later retrieval of limited historical location data. Narrow, targeted reviews based on reasonable suspicion may be treated differently from continuous or broad surveillance. The law in this area continues to develop.
What happens if the device malfunctions?
Technical problems are common. Wearers are generally expected to report and resolve charging or signal issues promptly. Repeated unexplained alerts can lead to violation proceedings, so documenting problems and communicating with probation is important.
Why Experienced Counsel Matters
GPS monitoring sits at the intersection of sentencing, probation conditions, and constitutional search-and-seizure law. An attorney who understands both the practical realities of electronic monitoring and the evolving article 14 framework can advocate for individualized findings, shorter durations, less restrictive alternatives, and, when appropriate, challenges to the use of location data. Early attention to these issues can significantly affect both the conditions of release or probation and any later criminal investigation that relies on the monitor’s records.
Contact Criminal Defense Attorney William J. Barabino
If you or a loved one is facing the imposition of GPS monitoring as a condition of release or probation, or has questions about the use of location data from an existing device, experienced representation is essential. The Law Office of William J. Barabino provides client-focused criminal defense throughout Massachusetts.
Call 781-393-5900 today for a confidential consultation.
Visit williambarabino.com for additional resources on probation, search and seizure, and related topics.
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Disclaimer: This article is for educational and informational purposes only and does not constitute legal advice. The law is subject to change, and the application of legal principles depends on the specific facts of each case. Reading this material does not create an attorney-client relationship. For advice regarding your particular situation, consult a qualified Massachusetts criminal defense attorney.
