I've had more and more questions about introducing GPS tracking data in criminal trials. When I think about digital evidence, I think about authentication as the first hurdle. This post summarizes the law regarding the authentication of GPS data. GPS data may come into criminal cases in several ways: because law enforcement placed a tracking device on a suspect’s vehicle; because a suspect was wearing a GPS tracking bracelet as a condition of probation or pretrial release; because law enforcement seized a cell phone or other device containing GPS data from a suspect; and so on. Although each situation presents slightly different considerations, it should often be possible to authenticate such data under Rule 901(b)(1) (testimony of a witness with knowledge that the data is what it is claimed to be), Rule 901(b)(9) (concerning “[e]vidence describing a process or system used to produce a result and showing that the process or system produces an accurate result”), or some combination of the two. The leading case in North Carolina is State v. Jackson, __ N.C. App. __, 748 S.E.2d 50 (2013). The defendant committed a sexual assault while wearing a GPS tracking device as a condition of his pretrial release. The supervisor of the electronic monitoring unit testified regarding how the tracking device worked. The defendant argued that the tracking data was not properly authenticated, but the court of appeals ruled to the contrary. However, the court did not analyze the authentication issue in detail -- instead focusing mainly on whether the [...]
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