Undercover filming to reveal drug dealing in Ballymun as schoolchildren pass by Tuesday, July 20, 2021 Undercover filming by RTÉ Investigates will tonight reveal “extensive” daylight drug dealing in Ballymun as schoolchildren pass by. The north Dublin suburb is experiencing an “acute” problem with crack cocaine use compared to other areas of the capital, according to the Health Research Board. In a special report tonight, RTÉ Investigates has been monitoring several locations where drugs are openly sold on the streets and secretly filmed one location close to a senior citizen housing complex in Ballymun over five days last month. On the first day alone, undercover cameras filmed over 42 potential drug deals in just one four-hour period during the afternoon.