Convicted drunk drivers will need to add a new device to their cars if they want to drive.

A new state law takes effect today mandating ignition interlocks on all vehicles driven by anyone convicted of felony or misdemeanor drunk driving.

Drivers have to blow into the device, which works like a breathalyzer, to be able to start their car.

The provision is part of “Leandra’s Law,” named for 11-year-old Leandra Rosado, who died in a drunk driving crash last year.

Leandra’s Law made it a felony to drive drunk with a child under age 16 in the car, and the interlock rule applies to everyone convicted of driving while intoxicated, including first-time offenders.

The interlocks will cost drivers between $75 and $100, plus monthly fees.

According to Mothers Against Drunk Driving, figures show states with ignition interlock laws have seen a 35 percent drop in fatal DWI crashes.

(Source: NY1)