Case C-430/10: Judgment of the Court (Fourth Chamber) of 17 November 2011 (reference for a preliminary ruling from the Administrativen sad Sofia-grad — Bulgaria) — Hristo Gaydarov v Direktor na Glavna direktsia ‘Ohranitelna politsia’ pri Ministerstvo na vatreshnite raboti (Freedom of movement of a Union citizen — Directive 2004/38/EC — Prohibition on leaving national territory due to a criminal conviction in another country — Drug trafficking — Whether measure can be justified on grounds of public policy)