Summerville Police conducted a checkpoint on Saturday evening that resulted in several citations for misdemeanor marijuana possession.  According to police reports, police cited three different people who produced small amounts of marijuana when questioned at the checkpoint.  The checkpoint was conducted at the intersection of Penn Street and East Washington Street.  Twenty-year-old Alissa Michelle Blackmon, thirty-year-old Xavier Martinique Lawrence and and thirty-one-year-old Dante Laneal Stewart were all cited for possession of marijuana less than one ounce.