That is a much lower burden than the probable cause standard required

under the Fourth Amendment, which guarantees the right of the people to

be secure against unreasonable searches and seizures.

Kevin Bankston, a senior staff attorney with the Electronic

Frontier Foundation, said the government's reliance on warrantless cell

tracking is cause for alarm.

"People should be concerned because, whether they realize it or

not, they're carrying a tracking device in their pocket," Bankston said.

"And phone companies are collecting data about where your phone is

located, even when you're not using it, that can reveal a really

intimate portrait of how you spend your days and nights, where you go,

who you associate with."