Just remember that the State of WA requires you to have a permit when you posess over 5 gallons of mushrooms. The permit is available from the county sheriffs office. Some land owners have set their own limits (usually 3 or 5 gallons) however you must have a forest products permit when posessing over 5 gallons of shrooms. Technically you even need the permit if the shrooms come from your own property. Violation of this law is a gross misdemeanor punishable by up to a year in jail and a $1,900 fine and requires a mandatory court appearance.