Forensic Science is a multidisciplinary science which helps in crime investigation. To link a suspect to a crime, DNA analysis has been playing a key role. According to the Locard’s exchange principle, when a suspect comes in contact with the crime scene, there is a transfer of evidence from the crime scene to the suspect and vice-versa. The suspect tends to leave the epithelial skin cells containing traces of his DNA on the surface which he comes in contact with. This DNA is referred to as touch DNA and can help in identification of the suspect involved in the crime. In crimes where identification of the suspect has proved to be a potential challenge for investigators, touch DNA has been an effective investigative tool. The present work throws light on the importance of touch DNA in criminal detection.