Ignition Interlock Devices (IID)
Compare providers, understand costs, and find installation centers near you.
Compare IID Providers
Intoxalock
Intoxalock is one of the largest IID providers in the nation with service centers in all 50 states and 24/7 customer support.
Smart Start
Smart Start has been in the IID business for over 30 years and is known for their small, discreet device design.
LifeSafer
LifeSafer is known for reliable fuel cell technology that works well in extreme weather conditions.
Draeger
Draeger is a German manufacturer known for precision engineering and professional-grade breathalyzer technology.
IID Requirements By State
Showing states that require IID for all DUI offenses. View all states →
IID FAQ
How much does an ignition interlock device cost?
Installation costs $0-$200 depending on the provider. Monthly monitoring/lease fees range from $60-$100. Total cost for 12 months is typically $1,000-$1,500.
How does an ignition interlock device work?
You blow into the device before starting your car. If your BAC is below the preset limit (usually 0.02-0.04%), the car starts normally. Random rolling retests are required while driving.
Can I choose which IID provider to use?
In most states, you can choose from a list of state-approved IID providers. Compare costs, device features, and service center locations before deciding.
What happens if I fail an IID test?
A failed test prevents the car from starting and is logged. Multiple failures or violations are reported to the court/DMV and can extend your IID requirement or result in additional penalties.