KEY POINTS:
Officials say Mexico's former drug tsar has been charged for allegedly taking US$450,000 to inform for the Sinaloa drug cartel.
The federal Attorney General's office says the cartel paid Noe Ramirez to warn its leaders of planned police operations against them.
Ramirez was detained in November.
Meanwhile, the Mexican Navy says it has seized 7 tonnes of cocaine from an unspecified kind of boat and detained five Mexicans.
