Does DNA prove I handled the object?

No.

The presence of DNA on an object does not necessarily prove that a person handled it.

DNA can be deposited through direct contact, but it may also be transferred indirectly through other people, clothing, shared surfaces, or subsequent handling after the original deposition.

Objects often accumulate biological material over time. DNA may persist from earlier use, move between surfaces, or be introduced through normal handling and environmental exposure.

Even where DNA is detected and associated with an individual, testing cannot determine when the material was deposited, whether the contact was direct, or what activity led to its presence.

In some cases, DNA may reach an item without the person ever touching it directly. Transfer through another person or through everyday interactions can result in biological material being deposited onto objects that were never handled by the original contributor.