File a civil suit against the county, there is already case law establishing that police do not have the right to seize a patient's plants. Payout is something like 4,800 dollars a plant, so that should be a $30,000 lawsuit, just on the illegally seized plants.

RCW69.51A.050

The lawful possession or manufacture of medical marijuana as authorized by this chapter shall not result in the forfeiture or seizure of any property.