34 C.F.R.  §300.532.  Evaluation procedures.

Each public agency shall ensure, at a minimum, that the following requirements are met:

...

(h) In evaluating each child with a disability under Secs. 300.531- 300.536, the evaluation is sufficiently comprehensive to identify all of the child's special education and related services needs, whether or not commonly linked to the disability category in which the child has been classified.