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Location Monitoring

Location Monitoring (LM) is a cost-effective alternative to detention and is a special condition imposed by the Court. There are three components of location monitoring: Home Incarceration, Home Detention, and Curfew.

Home Incarceration is the most restrictive, requiring 24-hour lockdown except for medical needs, court appearances, and activities approved by the court.

Home Detention requires the participant to remain at home except for pre-approved absences for employment, education, religious services, treatment, and court obligations.

Curfew is the least restrictive and requires the participant to remain at home during set periods of the day.

Stand Alone Monitoring (SAM) operates in conjunction with GPS technology and is used to enforce a specific condition of release. It is not a means of monitoring home incarceration, home detention, or a curfew. SAM ensures the client remains in a specific geographical area, complies with attendance at a specific program, or stays out of a specified area.


The following are various types of technology used to monitor the above-mentioned components of Location Monitoring (photos courtesy of BI):

Radio Frequency (RF)

RF technology utilizes a transmitter and Field Monitoring Device (FMD), which is placed in a client’s residence. The FMD requires an analog phone line and power source. The cellular version of the FMD utilizes a cellular signal and requires a power source.


Global Positioning System (GPS)

GPS uses a tracking device to record the locations of clients in the community.  This information is immediately available to the officer for review.



Alcohol Testing Device (Soberlink)

The Soberlink is a portable alcohol testing device and requires a cell phone. The Soberlink may be used in conjunction with one of the LM components (Home Incarceration, Home Detention, or Curfew).



Phone Numbers

Location Monitoring Schedule Request Line: 206-428-1744
Toll-free: 866-481-7978


Local Overview - RF

Local Overview - GPS