Police management is reviewing the effectiveness of CS gas sprays which are distributed to women officers but have been used only once in a year. The sprays were introduced for women officers who, unlike their male counterparts, do not carry batons. But it is understood the spray has been used only once, when a policewoman had to subdue a man causing a disturbance at Caritas Hospital on August 19. 'The unarmed police officer sprayed the CS gas on the upper body of the man during a struggle with him,' a source said. The gas gave the man a runny nose and teary eyes, and he then was subdued and arrested. The source said the fact the spray had been used only once did not necessarily mean it was not useful. 'It may be related to the beat system in which many policewomen are not on duty alone and can get help from other officers to subdue a violent suspect,' he said. However, he said the Force Committee on Firearms Policy was reviewing the different type of sprays available. The CS containers are 16 centimetres long, weigh 170 grams and have a maximum three-metre firing range. They are carried in a bag which hangs off the belt. The CS gas can cause a burning sensation in the mouth and throat and possible blistering of the skin. It may cause chest pains, difficulty in breathing, coughing, retching and vomiting. Officers are instructed to aim the gas at the aggressor's chest, not eyes.