Lindsay Lohan's Drug and Alcohol suppliers should be prosecuted.

In other events swirling around Lohan, who turns 21 on July 2, authorities who have been conducting undercover operations at trendy celebrity watering holes in recent weeks are seeking to find out if she was served alcohol before her weekend car crash.

California Department of Alcoholic Beverage Control investigators also want to know if Lohan or others were served after hours, agency spokesman John Carr said.