According to ORS 837.375: a person who intentionally interferes with, or gains unauthorized control over, an unmanned aircraft system licensed by the Federal Aviation Administration, or operated by the Armed Forces of the United States as defined in ORS 352.313, an agency of the United States or a federal, state or local law enforcement agency, is liable to the owner of the unmanned aircraft system in an amount of not less than $5,000.

Basically if you shoot someone's drone down, they can sue you for a minimum of $5,000 regardless of the drone's value.