An investigation is ongoing into allegations that a substitute teacher allowed her students to use illegal substances in Alaska. The Wasilla Police Department says the 27-year-old teacher was escorted off school property following the incident last week in the city north of Anchorage. Police were called after a school resource officer determined she had allowed students to use illegal substances inside the classroom. Medics responded to the school on reports of a possible overdose. The condition of that person is unknown. Police say the teacher has not yet been arrested, but multiple criminal charges are pending.