Individuals arrested in possession of 15 grams (1/2 ounce) of heroin or 200 grams (seven ounces) of marijuana are presumed by law to be trafficking in drugs.[124] Malawi Illegal Illegal Illegal Illegal Cannabis is illegal in Malawi, but remains a popular drug and widely cultivated; Malawian cannabis is famed internationally for its quality.[125] Chamba is grown mainly in central and northern regions like Mzuzu.[126] Mali Illegal Illegal Illegal Illegal Malta Illegal (decriminalized up to 3.5g) Illegal Illegal Illegal (Cultivation of a cannabis plant for personal use will no longer be punishable by a mandatory prison sentence or suspended sentence specialized doctors will be allowed to prescribe medical cannabis) As of 2015, simple possession is decriminalized, but remains an arrestable offense for the police purpose of collecting intelligence about drug trafficking.[127][128] Marshall Islands Illegal Illegal Illegal Illegal Mauritania Illegal Illegal Illegal Illegal Mauritius Illegal Illegal Illegal Illegal Mexico Illegal (decriminalized) Illegal Illegal Illegal (decriminalized) On 21 August 2009 Mexico decriminalized "personal use" possession of up to five grams of Cannabis.[129] In November 2015, the Supreme Court ruled that four individuals from the Mexican Society for Responsible and Tolerant Personal Use would be permitted to grow and smoke their own marijuana.