LAKE COUNTY, Fla. – A Eustis High School student was arrested after a gun was found in a backpack on Monday, according to the Lake County Sheriff’s Office.The sheriff’s office said the school resource deputy responded to a classroom after a teacher found a 9mm Kel-Tec Luger pistol in a student’s backpack.[TRENDING: How to get vaccine in Florida | New attractions coming to Central Florida theme parks | FDA to consider cutting vaccine doses in half]Investigators said the teacher advised she checked the backpack to find out who it belonged to and that’s when she found the weapon.Deputies said the pistol appeared to be rusted and inoperative.LCSO said the student did not know the gun was in the backpack and said he had “fished” it out of a.