Surgery that isn't really invasive. They make three small wholes, stick in three sticks. One controls the camera to show what's going on inside, the other two for the scalpul or scissers of sucktion or whatever. They could simply extract the dna without....
wait, maybe they'd have to remove the bread. Nah, they can manage with a crumb. I'm sure it isn't against the law to regurgitate(sp) a crumb!