 If passed, the legislation would take precedence over the Supreme Court ruling, but could still be constitutionally challenged. Advocates for decriminalization say Brazil's tough marijuana laws have led to high levels of incarceration for people caught with minor marijuana possession but convicted as drug traffickers. Brazil has the third largest prison population in the world. Carrie Khan, NPR News, Rio de Janeiro. I'm Lakshmi Singh, NPR News, in Washington.