Authorities seized and destroyed more than 15,000 marijuana plants from an outdoor growing operation Friday in Tuolumne County. No suspects were found at the location and no arrests were made, according to the Tuolumne County Sheriff's Department. Officials from the Tuolumne Narcotics Team, the state Department of Justice's Campaign Against Marijuana Planting and the U.S. Forest Service discovered the plants. The operation was found on U.S. Forest Service land in the Rose Creek area. The 15,771 marijuana plants had an estimated street value of $31.5 million, according to Sgt. Craig Davis, commander of the narcotics team. It was the narcotics team's first drug seizure this year.