Vehicle Code 23247 governs the misuse of an ignition interlock device, the IID required after most California DUI convictions. It makes several things a crime, and the consequences reach both the criminal case and the underlying DUI probation.
What the law prohibits
Section 23247 makes it unlawful to tamper with or try to circumvent an IID, to knowingly provide a vehicle without a required IID to someone whose license is restricted, and for another person to blow into the device or otherwise help the restricted driver start the vehicle. Each of these is a misdemeanor.
Why it matters beyond the new charge
Because the IID is usually a condition of DUI probation, a 23247 violation is not just a new offense. It can also be charged as a probation violation in the original DUI case, which exposes you to the suspended jail time and additional terms. The DMV can also restart or extend the IID requirement.
How these cases are defended
Many alleged violations have innocent explanations. A failed start can result from food, mouthwash, or a device malfunction rather than alcohol or tampering. Whether the conduct was knowing, and whether the device was working properly, are central questions. The device's own logs and maintenance records are important evidence.
Where to start
An IID allegation can put both a new case and your DUI probation at risk, so it should be handled carefully. Get a free written case analysis below or call me directly. See also the IID requirement checker.