Kelsey's Law on cellphone data

Has anyone been following the debates surrounding the recent enactment by a number of states of laws that require cellphone carriers to provide police with a customer's location information in case of emergency?  I saw a news report today that Missouri is the 8th state to enact such a law.  It seems to me like a good idea despite privacy concerns and concerns about possible legal liability of cellphone carriers for disclosing the information.  But I suppose a lot would depend on how the laws were actually drafted.  What is the best way to draft the concept of 'emergency' to protect civil rights concerns but still allow the police to investigate promptly and effectively in situations where time may be of the essence?  Has anyone compared the drafting of the various state acts on this point?  I would be interested in your thoughts.

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