Performance on the BVMGT-2 is used as a criterion in the differential identification of children as brain injured, perceptually handicapped, or emotionally disturbed. Why must the examiner use caution in interpreting and using tests results for these purposes?

Performance on the BVMGT-2 is used as a criterion in the differential identification of children as brain injured, perceptually handicapped, or emotionally disturbed. Why must the examiner use caution in interpreting and using tests results for these purposes?