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Yes, as long as the police use a neutral policy when stopping cars (such as stopping all cars or stopping every third car) and minimize any inconvenience to you and the other drivers. The police can't single out your car at a roadblock unless they have good reason to believe that you've broken the law.
For information on drunk driving/driving under the influence/driving while intoxicated, see Nolo's Drunk Driving, DUI, and DWI FAQ.
For clear and complete explanations of all aspects of criminal law and procedure, read The Criminal Law Handbook: Know Your Rights, Survive the System, by Paul Bergman and Sara Berman (Nolo). If you wish to speak with a criminal defense attorney, you can turn to Nolo's trusty Lawyer Directory to find a lawyer near you.