AUGUSTA — An inmate in a California prison has been convicted of conspiracy to distribute heroin, cocaine, marijuana and methamphetamine.

Authorities said Friday that 23-year-old Mark Razo also was convicted of using a telephone to commit a federal drug felony, following a five-day jury trial in in Bangor.

U.S. Attorney Thomas Delahanty II says Razo operated an interstate drug conspiracy from a California prison using contraband cellular telephones. Drug Enforcement Administration agents in Portland, Maine, who were monitoring a court-authorized wiretap, learned that Razo had arranged for a four-pound shipment of methamphetamine to Iowa.

Police in Iowa seized the shipment and learned that Razo arranged for the distribution of other drugs across the United States.

The conspiracy charge alone carries a maximum penalty of life and fine of up to $10 million.