DNA marking is a type of forensic identification.
It is a method to mark items in a way that is undetectable to the naked eye.
A unique DNA marker is applied to the item, and can be recovered to identify the item.
[1] DNA marking can be used to prevent thefts of objects that are hard to mark in any other way (e.g. copper cables).
[2][3] It can also be used to help separate between genuine and counterfeit electronics and other replacement parts.