In many states, one of the penalties that comes with a DWI charge is that you may have to install an ignition interlock device. These devices aren't seen in the wild often and can often take people by surprise, especially first time offenders. Here's what you should know about them.

A Breathalyzer, Just for You

An ignition interlock device, or IID, works much like a breathalyzer. If you blow into it and your BAC is of a particular level, or if the device detects any alcohol, it will prevent your vehicle from starting. The particular rules governing how you interact with the IID will vary by state.

There are good intentions behind the use of these devices. Ideally, they should prevent you from driving under the influence. Also, they will train you to think before you get behind the wheel. What can upset many drivers about them is their seemingly restrictive nature. In addition:

• The driver may have to pay to rent one out of pocket
• The length of the sentencing can seem too long for some
• Sometimes, they become required even without a DWI conviction

A sentence that involves the use of an IID can also contain other forms of punishment as well. Occasionally, even after probation or time served, the IID may come into play. To many drivers it can seem like they're being kicked while they're down.

How Many Offenses Before IID Becomes Mandatory

In many jurisdictions, the IID can become necessary at the judge's discretion. That means on your very first offense, or on your third, there's always a chance that you will have become familiar with the device.

In many states, the IID becomes a part of your sentencing depending on your BAC at the time of arrest. Other states make it mandatory depending on if it's the second or third DWI offense.

An IID is Often Preferable--and Often Negotiable

No matter how you may feel about the idea of an IID, they still play an excellent bargaining chip in your DWI defense. You may find the IID represents a far greater option than many of the alternative punishments that can come with a DWI charge.

In some cases, specifically asking for an IID can help to lower charges, reduce fines, or bypass the need for any jail time. That's why it's important to speak to a DWI attorney, no matter if it's your first offense or third. A lawyer can help you figure out your defense and let you know which options are available to you.