June 4 (UPI) -- A Pleasant Valley State Prison inmate in California will spend five more years in prison after pleading guilty to conspiring to possess and distribute illicit drugs via drone deliveries in 2021.

Michael Ray Acosta, from May 23 to Aug. 27, 2021, coordinated several drone deliveries of methamphetamine, heroin and marijuana from inside the state prison, Acting U.S. Attorney Michele Beckwith announced on Tuesday.

Acosta used a contraband cellphone to schedule the drug deliveries that four co-conspirators delivered by flying drones over the prison and dropped packages that Acosta and others would recover, Beckwith said.

The packages included drugs, cellphones, cellphone accessories and other items during what federal investigators dubbed "Operation Night Drop."

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