Court: Locating suspect via stingray definitely requires a warrant

"Riana Pfefferkorn, a lawyer affiliated with the Stanford Center for Internet and Society, said that the judge’s ruling was "careful," but she noted that it may not specifically matter, given that both state and federal policy has changed since Ellis and his co-defendants were arrested in 2013.

"This is resolving something that happened over four years ago where on a going forward basis it may be a moot point," she told Ars."