Community groups in Londonderry say that the vigilante group Republican Action Against Drugs (RAAD) has been carrying out paramilitary style shootings and is responsible for driving scores of people out of the city.
One woman, the mother of a drug user who was targeted by the group, described how her son was shot in the legs in a so-called punishment shooting.
"It had to be done", she said, "if it hadn't the consequences would have been worse".
Andy Martin, the BBC's correspondent in Northern Ireland and chief superintendant Stephen Martin, PSNI District Commander for the area, give their analysis of the issue.
You can hear the full interview on
on BBC Radio 4.
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