(a) Environmental testing laboratory assessments shall be conducted:      
        (1) before accreditation is granted, except as provided in §25.14 of this title (relating to Term of Accreditation); and       
        (2) at least every two years after an environmental testing laboratory receives accreditation.       
      (b) Assessments may be announced or unannounced.     
     Source Note:        The provisions of this §25.18 adopted to be effective September 12, 2002, 27 TexReg 8480