> Your assuming GMO's where modified in exactly the way intended. Realistically, attempting to insert segment X into something’s DNA and verifying the organism produces Y in no way insures that the only DNA modification was inserting X or that the only change from X is producing Y.
Both the processes and the regulatory compliance requirements around GMOs provide a lot stronger (though, still, not perfect) assurance of that for GMOs than the processes and (near complete lack of) regulatory clearance requirements around crop modifications that result in rapid genome changes but which are considered "traditional breeding" rather than "GMO" because they don't involve directly inserting genetic material from a different organism.
(I have an immediate family member who works doing both kinds of crop modifications, and has been involved providing science support for regulatory clearance of products, as well.)
Both the processes and the regulatory compliance requirements around GMOs provide a lot stronger (though, still, not perfect) assurance of that for GMOs than the processes and (near complete lack of) regulatory clearance requirements around crop modifications that result in rapid genome changes but which are considered "traditional breeding" rather than "GMO" because they don't involve directly inserting genetic material from a different organism.
(I have an immediate family member who works doing both kinds of crop modifications, and has been involved providing science support for regulatory clearance of products, as well.)