Can someone plant DNA?

Yes.

It is possible for DNA to be deliberately placed on an item or at a location, and there have been documented examples in Australia where individuals, including Police Officers, have been convicted for planting evidence.

However, DNA testing alone cannot determine whether biological material was deliberately placed. A laboratory result identifies that DNA is present and may indicate who it is consistent with — it does not reveal how it came to be there.

What can be examined is the process by which the evidence was generated. Forensic review can identify inconsistencies, anomalies, and erroneous results that require explanation. These may arise from the way exhibits were collected, handled, packaged, stored, or examined, or from how the DNA findings have been interpreted and reported.

Independent evaluation often involves detailed assessment of continuity records, procedural steps, sampling decisions, laboratory processes, and the sequence of handling from scene to analysis. Where irregularities or unexplained findings are present, these can be identified and scrutinised.

This process does not determine intent. Rather, it focuses on whether the evidence is scientifically reliable, whether procedures were followed appropriately, and whether the DNA findings can be interpreted with confidence.