What is "touch DNA"?

Touch DNA refers to the small amounts of DNA that are transferred from a person's skin to objects they come into contact with. This can occur through natural processes like skin cells sloughing off or through direct contact with surfaces. This kind of DNA can be critical for forensic science as it allows investigators to link individuals to specific items or crime scenes based on the presence of their genetic material.

In contrast to other forms of DNA evidence, such as DNA from hair follicles or bodily fluids, touch DNA is often much more challenging to collect and analyze due to the limited quantity of genetic material. It serves as a vital tool for law enforcement in identifying suspects and establishing connections between individuals and crime scenes. The focus on skin shavings highlights the unique nature of this type of DNA evidence and its particular relevance in forensic investigations.