Law enforcement use them by placing them on cars they are following unbeknownst ... | Hacker News

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dhimes on June 17, 2012 | parent | context | favorite | on: Illegal GPS Jammers Are Widespread, Study Finds

Law enforcement use them by placing them on cars they are following unbeknownst to the suspect. A jammer is an effective countermeasure.

mistercow on June 17, 2012 [–]

In the US, SCOTUS did at least rule that they need a warrant for that.

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