CALIFORNIA EVIDENCE: CIVIL AND CRIMINAL
...Method of Exam: Cross-Exam
......Ability to Perceive or Recall
.........Drug Usage
............Observing While Under Influence
2 Cards On This Topic:

In determining credibility of witness, must consider capacity and opportunity to perceive event.

Evidence of narcotics use not admissible to impeach in absence of expert testimony re its effects, proof that witness under influence at time of crime, and cross-exam.