Joshua Martin Parra-Davis, 23, of Arcadia, pleaded not guilty in Pasadena Superior Court, to charges of possessing and leaving an explosive device in a backpack near a bank on Foothill Boulevard in Arcadia, on Friday, January 14, 2011. He is charged with four felony counts, including possession of a destructive device near a school. Parra-Davis, a former Foothills Middle School student, was seen opening a classroom door last Friday and then later was seen dropping the backpack into some bushes. The bag contained what appeared to be a homemade explosive.