Prisons in Maryland, Virginia, California and Pennsylvania are using specially trained dogs to sniff out phones hidden inside cells and squirreled away in common areas.

• 在马里兰州、弗吉尼亚州、加利福尼亚州、宾夕法尼亚州的监狱里，人们正用专门训练的警犬来寻找藏匿在牢房和公共区域的手机。