Montgomery County officers will be manning a checkpoint tonight.
The law elevates underage drinking and driving to a class one misdemeanor, and doubles the driver's license suspension for the crime from 6 months to a year.
Kurt Erickson with the Washington Regional Alcohol Program, points out that an identical law was enacted in 2008 in Virginia, and expired two years later.
"The two years that it was on Virginia's books, the numbers went down significantly, so it actually can make a tremendous difference as it becomes a new law without a sunset provision," Erickson says.
Erickson says he'd still like to see Virginia pass law banning open alcohol containers in vehicles, as many other states do.