C.R.S. § 18-1.3-1101

As used in this part 11: (1) “Defendant” means any person charged with a class 1 felony. (2) “Mentally retarded defendant or defendant with an intellectual and developmental disability” means any defendant with significantly subaverage general intellectual functioning existing concurrently with substantial deficits in adaptive behavior and manifested and documented during the developmental period. The requirement for documentation may be excused by the court upon a finding that extraordinary circumstances exist.