Two things catch the eye in the office of Joselito Esquivel, a police colonel enforcing a national crackdown on drugs in the Philippines' most crime-ridden district: a pair of boxing gloves in a display cabinet and an M4 assault rifle lying beside him."It's all-out war," the Quezon City officer says of a spike in killings of suspected drug dealers by police across the country since last month's election of Rodrigo Duterte, a tough-talking city mayor, as the country's president."Duterte has already given the impetus for this massive operation," says Esquivel.Duterte has vowed to wipe out drug crime within six months but, according to Chito Gascon, head of the Commission on Human Rights, the aggressive rhetoric has already instilled a sense of impunity among the police."Basically, you have Mr Duterte saying: 'It's okay, I've got your back'," said Gascon.On average, at least one person has been shot dead by police or vigilantes every day since the May 9 election that swept Duterte to power - an escalation from the first four months of the year when the rate was about two a week.Handwritten warning signs have been left on some corpses.Duterte, who will be inaugurated today for a six-year term, has cheered the police on - after a druglord was killed in a northern province recently, he travelled there to congratulate them and hand over a reward worth about $6000.On Monday, Duterte branded as "stupid" human rights groups and lawmakers who have complained about his draconian plans to crush crime and reintroduce the death penalty."When you kill someone, rape, you should die," he told his last public meeting as mayor of Davao City, where death squads have killed hundreds of drug-pushers. ..