KEY POINTS:
US authorities conducting undercover operations at trendy celebrity watering holes in Los Angeles want to know if Lindsay Lohan, who is under the legal drinking age, was served alcohol before a weekend car crash.
California Department of Alcoholic Beverage Control investigators also want to know if Lohan was served after hours.
The drinking age in California is 21, and alcohol can't be served after 2am. Videos show 20-year-old Lohan leaving Hollywood's Les Deux club at 3.30am.
