Suit: Impalas defective, GM fixed only police cars

A lawsuit claiming a defect in Chevy Impalas is just the beginning of the allegations against General Motors. The action was filed in Detroit recently against the automaker claiming that 2007 and 2008 Impalas have defective spindle rods, which can cause wheels to misalign, increasing wear and the chance of a blowout. But perhaps worse, the suit claims that GM was selective in how -- and for whom