Nice to wonder about something you havent considered before though. Star for the op, but no flag since you made no comment yourself.
I never would have thought the unexplained might be discovered in a such a way though.
Any direct claims as such not on dateable film media must be excluded though, digital images immeadiately. I once made a perfect image of my 9 Yo
daugher holding herself as a baby, with digital editing software.
Nobody noticed until she herself ask when it was taken and who the baby was? We had alot of fun with it, including a new version with her holding her
mother as a baby.
Photographic flaws must be ruled out if objects are in question, as must light anomalies. Such anomalies rule out 99% of ghost images imo.
A genuine photo, scientically tested, would certainly bemind blowing though. A fun idea.