BISMARCK, N.D. (AP) — Charges have been dropped against a drone operator accused of stalking private security workers during a protest last year over the Dakota Access oil pipeline.

Myron Dewey had been scheduled for trial Wednesday on a misdemeanor stalking charge.

The Bismarck Tribune reports that prosecutors asked to drop the charge Monday after a judge ruled to suppress evidence taken from the drone, saying the state hadn't proved that authorities' seizure of the drone was legal.