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Serp Kannella the Odious writes:

In a Baltimore trial courtroom on Monday, a local judge threatened to hold a police detective in contempt of court for refusing to disclose how police located a 16-year-old robbery suspect’s phone.

But rather than disclose the possible use of a Stingray*, also known as a cell site simulator, Detective John L. Haley cited a non-disclosure agreement, likely with a federal law enforcement agency (such as the FBI) and/or the Harris Corporation, since the company is one of the dominant manufacturers of such devices. Stingrays can be used to determine a phone’s location, and they can also intercept calls and text messages.

Baltimore Circuit Judge Barry G. Williams retorted, "You don't have a non-disclosure agreement with the court," according to the Baltimore Sun.

* [Submitter's Note: Surely there's a joke about fishing expeditions to be had there.]