The Metropolitan Police allegedly bugged meetings between Stephen Lawrence's friend, Duwayne Brooks, and his lawyer, the BBC has reported.
The report states that Brooks and his lawyer were unaware that the meetings were recorded.
Scotland Yard told the the BBC that its directorate of professional standards was looking into the claim and that it was being treated with “huge seriousness”.
Doreen Lawrence has said it will "take a while to gain trust" after she met with the Metropolitan Police commissioner over smear claims.
Scotland Yard has been confronted with another accusation of underhand tactics in its investigation of the murder of Stephen Lawrence.
The father of murdered teenager Stephen Lawrence said he felt "betrayed" by allegations the Met Police tried to smear his family.