Freshly Exhumed writes from a report via CBC.ca: To protect police investigative techniques that may or may not have been used in a Calgary Police Service investigation, their controversial cellphone surveillance device will remain so secretive not even the make and model can be released to the public, according to a court ruling released Monday. The MDI (Mobile Device Identifier) technology — colloquially called a StingRay after Harris Corporation’s IMSI device, which mimics cell towers and intercepts data from nearby phones — is controversial in part because in at least one Canadian case, prosecutors have taken watered down plea deals rather than disclose information related to the device.

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Source: Slashdot – Calgary Police Cellphone Surveillance Device Must Remain Top Secret, Judge Rules