writes with this story from the Chicago Tribune: Last Fall, certified public accountant Dennis Nicholl boarded a Chicago subway train while carrying a plastic bag of Old Style beer. Nicholl popped open a beer and looked around the car, scowling as he saw another rider talking on a cellphone. He pulled out a black device from his pocket and switched it on. Commuters who had been talking on their phones went silent, checking their screens for the source of their dropped calls. On Tuesday, undercover officers arrested Nicholl. Cook County prosecutors and Chicago police allege he created his own personal 'quiet car' on the subway by using an illegal device he imported from China. He was charged with unlawful interference with a public utility, a felony. This is not the first time Nicholl has been charged with jamming cell calls. He pleaded guilty to a misdemeanor charge in June 2009, according to court records. He was placed under court supervision for a year, and his equipment was confiscated and destroyed.