Dallas County offices will be closed November 23rd and 24th in observance of the Thanksgiving holiday.

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Ignition Interlock Supervision

Ignition Interlock Supervision


ignition interlock device

If you are charged with a DWI, you may be ordered by the judge or magistrate to install an ignition interlock device on your vehicle and to report to the Pretrial Services Office for verification of installation and monitoring of the interlock device.

An ignition interlock device is a breath alcohol analyzer that is installed to a motor vehicle ignition. In order to start the motor vehicle engine, a driver must blow a breath sample into the analyzer which measures alcohol concentration. If the alcohol concentration exceeds the startup set point on the interlock device, the motor vehicle will not start (Title 37 Texas Administrative Code Rule 19.21).

If you have been released from jail with orders for ignition interlock device installation, please report to the Pretrial Services Office on the assigned date with proof of installation and the $10 monthly supervision fee.  The device must be installed with proof of installation by the given deadline date (within 30 days from the date of release from custody).

After the initial report, you will be required to report monthly to the DWI Ignition Interlock Officer with verification of calibration. You will be required to pay a $10 monitoring fee each month.

The Pretrial Services Office is located in the Frank Crowley Courts Building, 133 N. Riverfront Blvd., Dallas, TX 75207.  Enter the building from the main steps/building and the office should be on the 1st floor in Rm. A9.  Interlock Supervision is Monday through Friday, 8:30a.m. - 3:30 p.m.  APPOINTMENTS BY CALLS.  You may call the office at 214-875-2324.

Bond Supervision

urine lab test

Bond Supervision Unit (BSU) – 3 staff members supervise defendants released on bond with a statutory or court ordered requirement to have an alcohol monitoring device as a condition of release. The devices or tools available include, interlock, scram, sober link (portable), patch for alcohol, and urinalyses (drugs/alcohol, or both). The unit is currently supervising approximately 1250 cases.

Conditions of Bond

In addition, regular conditions of bond for all defendants include:

  • Pay required bond fee
  • Hire an attorney (if indigent and unable to hire an attorney, you can address that with the court during your first appearance)
  • Appear in court for all scheduled court settings
  • Notify the Pretrial Services Office to report a change of address or employment
  • Notify the Pretrial Services Office prior to leaving the Dallas/Fort Worth area
  • Remain arrest free pending disposition of current offense

When appropriate or necessary, the court may order additional conditions of release in which the defendant must comply.  Other conditions of bond include, but are not limited to:

  • Drug Testing
  • Ignition Interlock Device
  • Domestic Violence Orders (no contact with victim/injured party)
  • Curfew
  • Avoid certain locations and persons
  • Attend alcoholism or drug treatment
  • Psychological counseling
  • School attendance
  • Enrollment and/or completion of GED

A judge may at any time, modify conditions of release either reducing or increasing the level of supervision of the defendant, as deemed appropriate or necessary. Additionally, a defendant's release may be revoked by the court upon notification of non-compliance with the terms of supervision and/or conditions of release.