State of New Jersey v. Jule Hannah

Summary

The Supreme Court of New Jersey held that testimony interpreting cell site location information involves technical and specialized knowledge under N.J.R.E. 702 and must be presented by a qualified expert witness. The Court affirmed the Appellate Division’s reversal of Jule Hannah’s convictions, concluding that the lay testimony about cell tower data and the State’s related arguments risked misleading the jury and constituted an improper circumvention of the standards governing expert testimony.

Holdings

1. Historical cell site location information involves technical and specialized knowledge beyond the ken of the average juror and must be presented to the jury by a witness qualified as an expert under N.J.R.E. 702.
2. The trial court improperly admitted Detective Leyman's CSLI testimony as lay opinion testimony because the testimony interpreted and mapped tower data in a manner that permitted inferences about the location and movement of Hannah's phone.
3. The trial court's repeated limiting instructions did not cure the prejudice or confusion caused by the improperly admitted CSLI testimony and the State's contradictory summation arguments.
4. The CSLI conclusions presented through Detective Leyman were unsupported by adequate technical or objective data and would have constituted an impermissible net opinion even if offered by an expert.

Questions Presented

1. Whether testimony interpreting and mapping historical cell site location information may be presented by a lay witness under N.J.R.E. 701 or must be presented by a qualified expert under N.J.R.E. 702.
2. Whether the trial court's limiting instructions cured the prejudice and potential jury confusion caused by the detective's CSLI testimony and the State's related summation arguments.
3. Whether the admission of the CSLI testimony constituted reversible evidentiary error.

Disposition

affirmed