He said the garda presence in these areas needs to be enhanced. "Dealers are acting with impunity. We cannot have a situation where people attending rehab are targeted as soon as they step outside. There are people living in a constant state of fear and communities are being destroyed." Dr Garrett McGovern, who works in private practice and with the HSE's addiction services team, providing help in disadvantaged communities for those with drug addictions, said crack has become a major problem. He works in marginalised areas in west Tallaght and Crumlin. "Communities are being decimated out there with crack," he said. "Unlike the more expensive powder cocaine, crack is cheaper and smoked through a pipe."