Does DNA prove I was there?

No.

The presence of DNA does not prove that a person was present at a particular location.

DNA can be transferred directly or indirectly and may be deposited through prior contact, shared environments, or handling of objects. In some cases, DNA may appear somewhere even if the person has never been to that location.

Laboratory testing can identify biological material and sometimes a contributor. It cannot determine how the DNA was deposited, when it was left, or whether it resulted from direct presence at the scene.

Research has shown that DNA can persist on surfaces and move between people and objects over time. This means DNA detected at a location may reflect earlier contact, transfer through intermediary items, or movement after initial deposition.

For this reason, the presence of DNA alone does not establish that a person was physically present at the time of an alleged event. Interpretation requires consideration of timing, prior contact, transfer opportunities, and the broader circumstances of the case.