Cellphone discovery proportionality

The supreme court granted mandamus relief as to an overly broad request for cellphone data in the case of In re Kuraray America, holding:

[W]e conclude that the trial court abused its discretion by ordering production of Kuraray’s employees’ cell-phone data for a six-week or four-month period without a showing that each employee’s use of his cell phone on May 18 or 19 could have been a contributing cause of the ethylene release. …

Plaintiffs argue that cell-phone data from days, weeks, and months before the release is relevant because Kuraray negligently failed to supervise its employees and failed to implement adequate policies and procedures to protect against cell-phone misuse. But Kuraray’s policies regarding cell-phone use and its alleged failure to supervise its employees are relevant only if there is some evidence that cell-phone use could have been a contributing cause of the release itself.

No. 20-0268 (Dec. 9, 2022).