[TeMPOraL]

That is a good question, because there are two trends at play here. On the one hand, you have ever improving ability to create deepfake images, videos or audio recordings. On the other hand, AI-based retouching of photos and videos is now pretty much standard on mobile, some of it done by default and hidden from you in software. It wouldn't surprise me if the same was case with voice too.

Point being, it'll take more than just looking at the source image/video/audio for signs of AI manipulation, because soon enough, all recordings will be AI-manipulated before even hitting persistent storage.

In other words: everything will be deepfake by default, and the issue will turn into telling which deepfakes were done to lie about substantial aspects of reality pertinent to the case, and which ones were made to enhance some non-relevant qualities (aesthetics, compressibility, etc.).