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Which state became the first in the nation to require a warrant for cellphone location tracking?

Answer: Montana

Used for social networking sites and "checking in," location tracking provides cellphone users with a variety of services relevant to their location. But with the news of PRISM, the National Security Agency’s (NSA) online spying tool leaked by former CIA employee Edward Snowden, privacy concerns could be at an all-time high.

Rep. Daniel Zolnikov sponsored the bill that became law, requiring law enforcement officials to acquire a probable-cause warrant before tracking someone using his cell location information or via a GPS tracking device.