Snowball is a tame pet deer that the Oregon fish and game has seized for the owner not having a permit to keep her. I also live in Oregon and the laws here to keep, raise and breed wild animals are pretty lax. I personally know a local woman that had a permit to breed and raise snow leopards and indeed she had them. So why did they take Snowball? Probably becasue they could and it was a slow day at the office.
A side note:
Last I heard was that they were going to release Snowball's son into the wild, right at the peak of hunting season. Bucky (her son) is also tame. Where are these people's minds at – on vacation, hunting perhaps?