PONCHATOULA — A Tangipahoa Parish teacher arrested this week after allegedly possessing child sexual abuse material and having sexual contact with a student is no longer employed with the Tangipahoa Parish School System, Superintendent Melissa Martin Stilley said on Thursday. Thirty-year-old Trey Sparks was arrested Tuesday on four counts of possessing child sexual abuse material depicting victims under the age of 13 and one count of prohibited …