Mizzou students take heed: Columbia police will be conducting several checkpoints now through next weekend.  This time period includes Cinco de Mayo, as well as end of semester/college festivities.  There will be special emphasis on Missouri’s “zero tolerance” law which states that drivers under the age of 21 cannot have a blood alcohol concentration (BAC) above .02.   Younger drivers should be especially careful during this period and should plan accordingly and responsibly.