tpaudio writes "The ACLU and the EFF are suing the Department of Justice over how the government might be using GPS and location data from cell phones. With over 200 million Americans carrying cell phones, this could be pretty important for setting guidelines. We have already seen other frightening powers related to cell phones, such as 'cell mic tapping.'" The ACLU press release is also available, and it contains links to the complaint and the Freedom of Information Act request. We've previously discussed instances of cell phone tracking in the US and elsewhere.