Michael Kielhack (left), 20, of Elgin; Michael Montgomery, 19, of Naperville; and Thomas Quirke, 19, of Aurora, all face charges of unlawful delivery of a controlled substance. The three were arrested Thursday and Friday for their alleged roles in obtaining the LSD that was found in Oluwarotimi Okedina’s system when he fell 11 stories from a Stevenson Hall tower.