“The FDA allows companies not to list ingredients which make up less than 2% of the product.”
Not really true. All ingredients must be listed. BUT processing agents do not. For example, if lard was used to grease the cookie sheet.
“And what happens if Oreos changes their formula and puts actual dairy into the cookies? How will anybody know about the change?”
Actually the guy I spoke with told me that I need to call back in a few months to verify if there are any changes. So the OU does take that into consideration. Don’t go by heresay or rumors; call them.