A Sterling Heights teenager accused of threatening Henry Ford II High School was placed on house arrest after it is believed he made objectionable comments on social media, and will be evaluated for his current and prior mental condition.Ethan McElrath, 18, was placed on house arrest via a tether Monday by Judge Diane Druzinski of Macomb County Circuit Court, with the ability to leave his house for court and medical appointments, and was banned from the internet after possibly making some questionable comments on social media.