RCW 79.140.170: Sale of rock, gravel, sand, and silt—Investigation, audit of books of person removing.

The department may inspect and audit books, contracts, and accounts of each person removing rock, gravel, sand, or silt pursuant to any lease or contract under RCW 79.140.150 and 79.140.160 and make such other investigation and secure or receive any other evidence necessary to determine whether or not the state is being paid the full amount payable to it for the removal of the materials.