Can't. I already told her to delete them, because 1.) we have no use for or interest in her aunt's topless-park and nudie-beach photos anyway; and 2.) mere possession of the things could place one in violation of the law -- if a sufficient (and arbitrarily chosen) number of the pics exist, even without any actual malicious intent whatsoever.
Here's the question: if my wife had no actual intent to distribute (as opposed to cockamamie "presumed intent"), then why would her mere possession of a bunch of her aunt's Photo CD files itself be a matter of concern of Law at all?
It seems to me that if we can trust a Jury to determine whether or not such pics are "provocative" or "pornographic", we can trust them to determine whether or not there was any malicious "intent to distribute". But the law makes such Presumption of Innocence dependent upon an arbitrary number, not the consideration of the Local Community (as represented by a Jury of peers) as to whether or not any malicious intent to distribute actually existed at all.
Anyway, the wife's home from her early Sunday shift (home health care), so we have to get ready for Church now. I'll look for your response later.
Seriously CC, you need to get over your paranoia.
Here's the most likely scenario of a charge of possession of child pornography involving your situation:
The pictures some how get out of your possession (they were stolen out of your car, etc) and they end up in the hands of a known pedophile. Law enforcement then could use the possession part of the statute to charge said pervert with a crime.
Seriously CC, the law isn't evil, it's made to help protect the innocent, not put them away.
What kind of church do you go to? (I would suggest that you find a pastor that shares the word of God as it was meant to be heard, not some PC liberal denomination).