Judge threatens detective with contempt for declining to reveal cellphone tracking methods

Baltimore prosecutors withdrew key evidence in a robbery case Monday rather than reveal details of the cellphone tracking technology police used to gather it.
The surprise turn in Baltimore Circuit Court came after a defense attorney pressed a city police detective to reveal how officers had tracked his client.
City police Det. John L. Haley, a member of a specialized phone tracking unit, said officers did not use the controversial device known as a stingray. But when pressed on how phones are tracked, he cited what he called a "nondisclosure agreement" with the FBI.
"You don't have a nondisclosure agreement with the court," Baltimore Circuit Judge Barry G. Williams replied. Williams threatened to hold Haley in contempt if he did not respond. Prosecutors decided to withdraw the evidence instead.

http://www.baltimoresun.com/news/maryland/baltimore-city/bs-md-ci-stingray-officer-contempt-20141117-story.html