A Zern’s Farmers’ Market vendor is accused of selling marijuana-laced brownies from her stand at the market, located in Douglass Township. 36-year-old Sara Ellers of Mont Clare is charged with various drug offenses.  Members of the Montgomery County Drug Task Force searched her stand, known as Saharah’s Treasures, late last month after a month-long investigation.  Police say Ellers sold the brownies under-the-counter to people who asked for them.  She sold custom-made jewelry, tie-died shirts and other items over-the-counter.