Former Presidents of Mexico, Colombia, Brazil, Chile, Nigeria, Cape Verde, Switzerland & Poland; Former Prime Ministers of Greece, Hungary & The Netherlands Join With Distinguished Scholars, Celebrities, Clergy, Business Leaders, Elected Officials, and Others in Calling for Alternatives to Prohibitionist Drug Control Policies; âHumankind cannot afford a 21st century drug policy as ineffective and counter-productive as the last centuryâs,â Letter Says