CALIFORNIA EVIDENCE: CIVIL AND CRIMINAL
...Opinion & Scientific Evidence
......Lay Opinion
.........Proper Subjects
............Explanation of Photograph
2 Cards On This Topic:

Nonconflicting evidence which enhances and explains photographic evidence should be admitted.

By introducing expert testimony re alleged deficiencies in photospread methodology, D "opened the door" to FBI Agent's rebuttal testimony by raising specific issue of whether methodology made photospread unduly suggestive.