The Wall Street Journal's Jennifer Valentino-Devries reports on issues raised by the FBI's use of cell phone-tracking devices, sometimes referred to as "stingrays," and whether authorities need search warrants to employ the devices when apprehending suspects. In a U.S. District Court in Arizona, a defendant has argued that the use of the "stingray" without a warrant "disregards the United States Constitution." One state authority says that officers do not need warrants because stingrays do not "intercept communication, so no wiretap laws would apply." (Registration may be required to access this story.)
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