Last month, a Maryland investigation that included wiretaps on prison cell phones resulted in drug and weapons charges for two dozen people, including four state prison officers.

• 上个月在马里兰州，警察在监狱内的手机上安装窃听装置进行调查，结果有二十多人因毒品、武器交易受到指控，其中还包括四名州立监狱的狱警。