A new study finds more designated drivers may not be sober when they get behind the wheel.

The Journal of Studies on Alcohol and Drugs revealed 40% of designated drivers drink some alcohol before driving, and nearly 10% drink to a level that could impair their skills.

Health experts recommend avoiding any alcohol if you are the driver or if you do choose to drink, at least wait long enough before you get behind the wheel.

"I would give it a good hour until you're going to leave if you're going to have that one standard drink, and keep in mind that you are not making the drink, whoever is making you a drink could be putting more alcohol or liquor into your drink," said Gundersen Health System Wellness Education Specialist Shayna Schertz.

Earlier this year, Federal Accident Investigators recommended the U.S. lower the drunk driving limit from .08 to .05.