Surrounded by a circle of grinning undercover cops in jeans and polo shirts, their badges swinging from silver chains around their necks, Miami Police Chief John Timoney stands on the most dangerous corner in Overtown."The vast majority of homicides in Overtown happen within two blocks of this corner," Timoney says, speaking into a forest of television microphones at NW 2nd Court and 12th Ave. "And the vast majority of those homicides are related to drugs."Earlier this week, Timoney announces, M
