Blair Criminal Defense Lawyers | September 11, 2025 | Criminal Defense
If you are arrested for driving under the influence (DUI) in San Diego, you may be required to install an ignition interlock device (IID) on your vehicle. California has expanded IID use across the state, and San Diego courts often impose these devices after a DUI conviction.
Learning about how IID laws work can help you know what to expect and how to protect your rights. If you’ve been charged and need legal help, reach out for a free consultation today.
What Is an Ignition Interlock Device?
An IID is a small breath-testing machine installed in your vehicle. Before starting the car, you must blow into the device. If it detects alcohol above a certain limit, the car will not start. Some devices also require “rolling tests” while you are driving to ensure you remain sober.
California law requires that only state-approved vendors install IIDs. The devices must also be regularly calibrated and maintained. Costs for installation and upkeep fall on the driver as well, which can add up quickly.
When Is an IID Required in San Diego?
Under California Vehicle Code § 23700, IID requirements apply broadly after DUI convictions. In San Diego, the length of time you must use an IID depends on the circumstances of your case, including prior offenses and whether the DUI caused injuries.
- First-offense DUI (non-injury): Up to 6 months with IID, or a 1-year restricted license with no IID
- First-offense DUI with injury: Mandatory 6 months with IID
- Second offense: 1 year with IID
- Third offense: 2 years with IID
- Fourth or subsequent offense: 3 years with IID
In addition, if your license is suspended by the Department of Motor Vehicles (DMV), installing an IID is often the only way to regain your driving privileges.
Costs of an IID
IID costs can be significant. On average, installation runs between $70 and $150, with monthly maintenance fees of $60 to $80. Drivers must also pay for calibration appointments, typically every 60 days. For individuals already facing fines, court costs, and increased insurance premiums, IID expenses can be a major burden.
Low-income drivers may be eligible for reduced fees, but proof of income must be provided and it is not a guarantee that you will be approved.
What Are the Consequences of an IID Violation?
California law imposes strict rules on IID use. If you take certain actions like attempting to tamper with the device or asking another person to blow into it, you can face additional penalties.
These may include:
- Extension of the IID requirement
- Additional license suspension
- New misdemeanor charges
Generally speaking, IID violations can make your DUI case more difficult to defend and may lead to harsher punishments as a result.
How a San Diego DUI Defense Lawyer Can Help
An experienced DUI lawyer can make all the difference in how IID requirements impact your life.
Your attorney can take many steps on your behalf, such as:
- Challenging the underlying DUI charges to avoid an IID altogether
- Advocating for reduced penalties if an IID is unavoidable
- Helping you navigate DMV hearings to protect your license
- Advising you on compliance to avoid new charges
A strong legal defense may lead to reduced charges or even an outright dismissal, depending on the facts of the case.
Contact the San Diego DUI Lawyers at Blair Defense Criminal Lawyers for Help Today
Ignition interlock device laws in San Diego are strict, and they affect nearly everyone convicted of DUI. While these devices are meant to prevent repeat offenses, they also carry significant costs and restrictions.
If you are facing a DUI charge in San Diego, it is essential to understand how IID requirements may affect your future. Set up a free consultation with an experienced San Diego criminal defense attorney at Blair Defense Criminal Lawyers today to get started.
For more information, please contact the San Diego criminal defense attorneys at Blair Defense Criminal Lawyers for a free consultation. Give us a call at (619) 357-4977, or visit our convenient location:
Blair Defense Criminal Lawyers San Diego
225 Broadway Suite 1740
San Diego, CA 92101
(619) 357-4977
24/7
