Ignition Interlock Devices (IID)

Melanie’s Law

The Act Increasing Penalties For Drunk Drivers in the Commonwealth, also known as “Melanie’s Law,” went into effect on October 28, 2005. Its purpose, as suggested by its name, is to enhance the penalties and administrative sanctions for Operating Under the Influence (OUI) offenders in Massachusetts. Melanie’s Law requires that an Ignition Interlock Device (IID) be used both by drivers with a hardship license and by drivers whose licenses are eligible for reinstatement. In addition to this new law, the Registry of Motor Vehicles (RMV) is changing its policy regarding who is eligible for a hardship license. To be eligible for a hardship license, you must now be able to present proof that you do not have access by public transportation to your required destination.

Download the RMV brochure on Ignition Interlock Devices. (PDF)

What Is An Ignition Interlock Device (IID)?

An IID is a handheld breath-alcohol monitoring device (approximately the size of a cellphone) that is electronically connected to a vehicle’s
ignition. Before starting your vehicle, the IID requires you to take and pass a breath test. It also requires you to take re-tests while you are operating the vehicle.

Operator’s Responsibilities

Upon notification that you need an IID, you are responsible for all of the following:

Minimum Vehicle Requirements For IID Use

In order for an IID to be installed, your vehicle must have a 12-volt electrical system and it must be in good running order. Check with an IID vendor for more details.