Per Se Law:

The "per se" drunk driving laws, which were passed in all 50 states, mean that if a driver registers blood alcohol level of .08,  that driver is presumed intoxicated, no matter what the outcome of any roadside test shows.  The passing of the "per se" law was a goal of Mothers Against Drunk Driving (MADD) and was encouraged by a federal highway transportation bill that connected future federal funding to the passing of such state laws.

Zero Tolerance Law:

Zero tolerance is a state law that went into effect on January 1, 1995. The law states that any person under the age of 21 who drives after consuming alcohol, with a BAC of .01 or more, will have their driving privileges suspended. There are exceptions to this law , however -- minors who consume alcohol as part of a religious service or those who ingest a prescribed or recommended dosage of medicine containing alcohol.