DUMAGUETE CITY—The Philippine National Police is looking into the possibility of stamping out the marijuana problem by replacing marijuana plantations with another addictive but equally lucrative substance—coffee. PNP Deputy Director General Ricardo de Leon, commander of the anti-illegal drug operations task force, said they are studying what coffee varieties would grow in areas formerly planted to marijuana. “Marijuana is so toxic that after the soil is planted to it, no other crop can grow there,” De Leon told reporters Friday while on a visit to this city and Negros Oriental, where he was provincial commander of the defunct Philippine Constabulary-Integrated...