The amount of shellfish established by (a) or (b) of this subsection shall be presumed to be the amount wrongfully taken unless the defendant shows by a preponderance of evidence that the shellfish were lawfully taken or that the defendant did not take the shellfish presumed to have been wrongfully taken. Whenever there is reason to believe that shellfish in the possession of any person were wrongfully taken, the department or the department of fish and wildlife may require the person to proceed to a designated off-load point and to weigh all shellfish in possession of the person or on board the person's vessel.
RCW 79.135.030