The plain-clothes police are always there, watching Xu Jiehua.

便衣警察一直在那里，看着许洁华。

youdao

Civilians then checked IDs again, fearing plain-clothes police might seek to act as agents provocateurs.

平民们接着再次检查身份，唯恐可能混入便衣警察伪装的奸细。

youdao

While the testing, by plain-clothes police, is voluntary, any male refusing to take part could come under suspicion.

尽管检测由便衣警察负责且是自愿的，但是任何一位拒绝参与的男子都可能受嫌疑。

youdao

Mr Cao says that since late July plain-clothes police have followed him everywhere and, he suspects, tapped his phones.

ECONOMIST: Politics in China

One group recently attacked several stallholders at an open-air market in Rafina, a port near Athens, after posing as plain-clothes police checking their permits.

ECONOMIST: Greek politics

On February 4th Mr Diallo, a young Guinean with no criminal record, was challenged outside his apartment building by four plain-clothes police officers, looking for a rape suspect.

ECONOMIST: ��Justice must be done��