Potential utility of Touch DNA in forensic investigations

Abstract

Chance prints available at the crime scene and secondarily transferred cellular material can be a good source of DNA if processed properly. DNA transferred on to the contact surface is directly correlated to perspiration, and the shedder status of an individual. The advantage of this technique is that the latent fingerprints can be first used for fingerprint analysis by application of powder method and can then be processed for generating profiles. This review article focuses on the individual specific factors affecting transfer of DNA, impact of handling time, pressure and environmental factors etc. This literature survey has been done to summarize the various factors influencing touch DNA recovery, its methods of collection and extraction. It is crucial to analyse DNA recovery using various protocols. This article discusses the significance and potential utility of touch DNA in investigation of medico-legal cases.