Scientists in Israel have demonstrated that it is possible to fabricate DNA evidence.
The scientists fabricated blood and saliva samples containing DNA from a person other than the donor of the blood and saliva.
They also showed that if they had access to a DNA profile in a database, they could construct a sample of DNA to match that profile without obtaining any tissue from that person.
The planting of fabricated DNA evidence at a crime scene is only one implication of the findings. A potential invasion of personal privacy is another.
More of this eye-opening and troubling story here.