Radon levels far above amounts posing cancer risks plagued the basement of Ann Arbor's city hall where police officers worked for many years, city records show. Top city officials were aware of the problems, but measures taken — including a mitigation system installed in the 1990s — failed to keep radon below federal safety levels, and it wasn't until 2009 that the city moved employees out of the basement. Members of the police officers union believe there may be a link between the radon in the air they breathed in the basement offices — along with asbestos and mold issues — and health problems experienced by several officers, including two recent deaths. Vada Murray, 43, a police officer in Ann Arbor for two decades and a former defensive back for the University of Michigan football team, died April 6 two and a half years after a lung cancer diagnosis. He never smoked. Read the story here.