Commonwealth v. Davis
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The Supreme Judicial Court reversed Defendant's convictions of armed assault with intent to murder and related charges, holding that the trial judge erred in admitting evidence obtained from a global positioning system (GPS) device that Defendant was wearing at the time of the crime.
Due to his probation on a federal drug charge, Defendant was wearing a GPS ankle monitor on the night of the shooting at issue. During trial, the court admitted data from Defendant's GPS device showing his location at the time of the shooting and that his speed matched the shooter's movements. The Supreme Judicial Court reversed Defendant's convictions, holding that because the GPS device Defendant was wearing had never been formally tested for its ability to measure speed, the trial judge abused his discretion in admitting the speed evidence.
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