On February 23, 2010, the NRC issued a Notice of Violation for a SLIII violation to Gamma Knife Center of the Pacific for a failure to implement 10 CFR 35.41(b). Specifically, as of July 2, 2009, the licensee failed to develop, implement, and maintain written procedures to provide high confidence that each medical administration is in accordance with the written directive in that the procedures did not require explicit verification that the administration was in accordance with the treatment plan and written directive. Consequently, the treatment plan and written directive were not followed to ensure that the collimator was used in the treatment of a patient.