marie, for starters, who wanted justice from minute one
secondly, its a massive, months long, nationwide drug investigation. months had passed before walt came back to town. its a stretch to assume jesse would not come up in the investigation.
finally, jesse pointed a gun at walt in the final shoot out, dropped it, and left, and we see cops show up. there's finger prints there.
there's a million ways for the dea to know about jesse.
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