Nassau County police officer Litterello walks out of the courtroom after he was summoned as the first witness of Chinese comedian Zhou Libo's case at the preliminary hearing at Nassau County Court in Nassau County, New York, the United States, on March 23, 2018. The Nassau County Court on Friday conducted the first preliminary hearing of the case of Chinese comedian Zhou Libo, who is facing weapon and drug charges. (Xinhua/Wang Ying)