Allow councils to use plain-clothes inspectors to detect parking-badge fraud and to recover badges that have been cancelled.
Mr Cao says that since late July plain-clothes police have followed him everywhere and, he suspects, tapped his phones.
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.
"In recent days several correspondents have encountered groups of violent, plain-clothes thugs" who were "operating in groups of more than a dozen, " the warning continued.
The BBC's Owen Bennett-Jones says the trouble began when one of Mr Sharif's co-accused claimed that there were plain-clothes intelligence officers in the courtroom on Wednesday.
She had no time for semantics: whether to include deaths outside the city walls, whether the plain-clothes soldiers had been billeted with civilians, and so on.
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.
Instead I was arrested by two plain-clothes policemen, and taken into custody, where my madness saw me strip naked and draw messages on the walls of my barren Hamilton cell.
Azeris in Moscow say that one compatriot, a street vendor, was beaten to death this month by plain-clothes police after a row over a Russian who urinated on his kiosk.
ECONOMIST: Russia's police no longer know how to handle a riot
Mr Saravanapavan said that on Tuesday night, the editor of his Jaffna paper was beaten by plain-clothes soldiers while trying to cover the unrest and had to be admitted to hospital.
Plain-clothes police lurk everywhere in Lhasa and the towns.
Elsewhere, in Palpa in the south-west, three teenagers following a tradition of raising money for a Hindu festival on March 24th were shot dead when they approached a car carrying plain-clothes soldiers.
On the contrary, the government's tactics, along with Mr Khamenei's silence and the increasingly ungloved intervention of the Revolutionary Guards, the elite military corps that commands the plain-clothes baseej militia used for crowd control, may reflect a growing sense of desperation.
Plain-clothes agents of the Committee for the Promotion of Virtue and Prevention of Vice, as the religious police are known, patrol streets, parks and shopping centres, intervening to scold offenders, strike them with switches or haul them off to be disciplined by ordinary police.
Fatah-linked Palestinian security officers in plain clothes manned the barricades and lit tyres.
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