Not really. Experts can still detect if something is a deep fake, and the punishment for trying to pass one off as evidence is severe.
And if they wrongly testify that a genuine video is fake, it's much harder to claim that they submitted false evidence.
Currently. Currently, experts only can determine if something is a deep fake.
Considering that we're still in the infancy of deepfakes, this is not a reliable defence against deepfakes being used as evidence.
/s
For how long?