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> No matter what a classical plant breeder does with tomatoes, you can assume its safe for anyone with a peanut allergy to eat them
You cannot make this assumption due to random mutations. If prolamin protein appeared in peanut, it could appear in tomato as well.*
With CRiSPR you can be pretty certain that nobody will put peanut cupin and prolamin proteins into tomato just to cause allergy in people.
* obviously probability is close to zero due to different evolutionary paths