The Supreme Court is going to hear arguments today about the use of cellphone data in criminal investigations. This case involves a robber named Timothy Carpenter that was caught after cops requested his cell phone data (locations) from his carrier and used it to place him at the scene of multiple robberies. The defense says they should have gotten a search warrant and that the data was illegally obtained. I'm not sure which way this is going to go, but I suspect the government may win this one. The legal fight has raised questions about the degree to which companies protect their customers' privacy rights. The big four wireless carriers, Verizon Communications Inc, AT&T Inc, T-Mobile US Inc and Sprint Corp, receive tens of thousands of these requests annually from law enforcement.