Retrieval of DNA and genetic profiles from swabs taken inside cars

Abstract In two studies of swabs taken inside cars, the success rates of retrieving DNA and genetic profiles were estimated. Study I comprised data from actual casework analysed in the period 2003–2004. In Study II, swabs from cars were made by one police officer in a controlled experiment. The overall success rate of retrieving sufficient DNA from the swabs was 22% in Study I and 86% in Study II. The success rate was not influenced by the amount of water used for the swabs or on the storage conditions. The sampling technique seemed to be responsible for the differences in success rate between the two studies.