Jane Deighton, the lawyer for Stephen Lawrence's friend Duwayne Brooks, has said that allegations that the Metropolitan Police recorded their meetings are "horrific".
Scotland Yard has 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.