We have been able to manipulate legal documents for 100s of years. We have been able to manipulate images for over 100 years. We have been able to manipulate images on any computer with a few hours of training for for 30+ years. We have been able to manipulate videos with training for 20+ years.

It is an order of magnitude easier now (likely as easy as documents have been to manipulate for 30ish years now). However, this is not a new problem, courts have always had to deal with manipulated evidence.

Not just an order of magnitude easier, many orders of magnitude. We're going from hours of painsraking work done by professionals who you pay to virtually instant and as many as you want.

That is for the jury to decide. If they think the evidence is fabricated in some way, they will have reasonable doubt.

Lawyers must carefully pick jurors depending on how susceptible they may be to AI manipulation.

Good eating for "expert witnesses" that can verify/debunk videos in court.

Can AV evidence not be faked without AI tools?