Because sometime after it was seized the squirrel bit someone and apparently the only way to test if an animal had rabies is to take a chunk of its brain and analyze it, which means they had to kill it in order to see if it had the disease.
also this video is pretty interesting on the subject and had some info i didnt know about and backs a bit of what i said but better explained https://youtu.be/_HIWhGB4doY?t=138
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