AI can help detect deepfake scams, but detectors lose much of their accuracy on real-world fakes. Investigators get further by following the evidence criminals can’t fake, like payment trails and reused infrastructure. Law enforcement AI has to be defensible: documented provenance, a repeatable method, and a human investigator exercising judgment and making the calls. 

Source: https://www.trmlabs.com/resources/blog/how-law-enforcement-uses-ai-to-fight-ai-enabled-crime