A Met Police Detective Constable was arrested in Norbury along with three other men on Friday night on suspicion of drug charges.
The four men were arrested at 7.20pm at a Norbury address by the force's anti-corruption group.
Among the alleged offences was possession of Class B drugs with intent to supply. The DC, in his 30s, operates from a south London police station.
The four were taken to various stations for questioning and have been bailed to return on May 18.
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