Some of what I do is related to "data veracity" - is the data what it says it is? I generally deal with business files, but data is data. For example, a person says they texted someone and they provide a screen shot of the data. That image proves nothing unless you have access to its metadata. On what device was this data created? Where was the device when the data was created? When was the data created? Does that align with the represented provenance of the file?
For image files like the ones that AI will generate, unless they're super sophisticated, casual assessment of the metadata associated with a file ought to reveal its origins. It's at the basis of the document management I'm involved with for litigation.
How do you do that? On a Mac, right click on a file and select "Get Info". On a PC, right click on a file and select "Properties". You'll see when the file was created, modified, etc. For photos, you will have EXIF information that includes things like exposure, device and the like. Some photos, particularly those shot on phones or other mobile, cellular devices, may bear location information, as well.
Metadata tells all.
If your lucky to see the “questionable” content on a device, all that is a great way to check validity of the content. Not sure how to check validity of a picture that may be “questionable” when viewed in/on media like TV or a manipulated picture printed in a magazine, newspaper or solicitation.
OM