This article outlines new laws regarding feral pigs in Oregon, and the requirement to eradicate them on private land.
http://www.heraldandnews.com/news/article_eb667764-7b92-11e0-ae14-001cc4c002e0.html
http://www.heraldandnews.com/news/article_eb667764-7b92-11e0-ae14-001cc4c002e0.html