(c) Parental consent for reevaluations.
(1) Subject to paragraph (c)(2) of this section, each public agency—
(i) Must obtain informed parental consent, in accordance with §300.300(a)(1), prior to conducting any reevaluation of a child with a disability.
(ii) If the parent refuses to consent to the reevaluation, the public agency may, but is not required to, pursue the reevaluation by using the consent override procedures described in paragraph (a)(3) of this section.
(iii) The public agency does not violate its obligation under §300.111 and §§300.301 through 300.311 if it declines to pursue the evaluation or reevaluation.
(2) The informed parental consent described in paragraph (c)(1) of this section need not be obtained if the public agency can demonstrate that—
(i) It made reasonable efforts to obtain such consent; and
(ii) The child’s parent has failed to respond.