Thailand’s new prime minister vowed to restrict the use of marijuana for medical purposes after thousands of weed shops opened across the country since the nation became the first in Asia to decriminalize cannabis a year ago. The government will seek to “rectify” its cannabis policy and rampant sprouting of dispensaries that freely sell the drug within a six-month time frame, Srettha Thavisin said in an interview with Bloomberg Television’s Haslinda Amin on Wednesday in New York. [time-brightcove not-tgx=”true”] “The law will need to be rewritten,” Srettha said.