High Tech High School students in Secaucus were evacuated for an hour at midday Friday while authorities investigated a possible threat at the school, according to one student and a brief note sent to parents. The students at the county school in the southwest corner of the town were escorted out of the building at 11:30 a.m. and they were finally allowed back in at 12:30 p.m., one of the students told The Jersey Journal through a parent. The students were not told at the time what was going on as Hudson County sheriff’s officers arrived at the campus. A student said it was believed that there…