The principal at a North Port charter school is pushing for a drug testing policy that would easily be the most aggressive in the area. Imagine School at North Port hopes to begin drug testing students at its junior high school campus next school year, including sixth-graders. Students would be required to pass a drug test to attend the school and pass at least one random drug test per year to remain enrolled. The proposal may put the charter school’s management at odds with Sarasota County Schools, which take the view of civil rights advocates that testing all students would violate the Fourth Amendment.