manila head philippines narcotics control body resign five months job second successive official vacate post make statements contract president rodrigo duterte retire army general dionisio santiago tuesday say quit chairman dangerous drug board receive call duterte executive secretary days publicly say construction 10,000-bed mega drug rehab facility mistake counter illicit drug centerpiece policy duterte presidency repeatedly threaten kill dealers users say will jail crackdown kill thousands filipinos administration insist commit arrest dealers rehabilitate users cite new facility voluntary surrender 1.3 million addict pushers sign positive intent rule boss always right think boss right refer rule santiago tell radyo inquirer add already submit two-sentence resignation letter santiago say government may miscalculate rehab center pursue practical community-based rehabilitation program few 500 people admit facility launch last year amid great fanfare fund wealthy chinese businessman duterte give santiago job june former head force quit dispute president repeat statements four million filipino drug addict duterte never disclose source information experts say exaggerate separately duterte new health minister francisco duque tuesday voice approval use marijuana research purpose medicine say would prefer marijuana pharmaceutical form country legalize use raw form uncontrolled subject abuse addiction say first news conference believe risk profound pending bill congress legalize regulate medical use cannabis philippine drug board chief quit contradict duterte