THE AUTHOR DEMONSTRATES THE ACTUAL TECHNIQUES OF WITNESS INTERROGATION IN A MANNER CONSISTENT WITH THE RULES OF EVIDENCE AND PROCEDURE DEVELOPED IN THE FIRST TWO VOLUMES. MODEL QUESTIONS FOR DIRECT AND CROSSEXAMINATION HAVE BEEN CONSTRUCTED. SOME OF THE SPECIFIC AREAS OF EXAMINATION INCLUDE THE BACKGROUND INQUIRY, VARIOUS SPECIALIZED MEDICAL AND TECHNICAL EXPERTS, HYPOTHETICAL QUESTIONS, CHAIN OF CUSTODY, AND THE OFFERING OF EXHIBITS. THE BEST EVIDENCE RULE, AND THE USE OF PHOTOGRAPHS, MOTION PICTURES, RECORDINGS, AND VOICEPRINTS ARE DISCUSSED. CONVERSATIONS AND CONFESSIONS, BUSINESS RECORDS, CHILD WITNESSES, CHARACTER WITNESSES, AND CROSS-EXAMINATION RULES AND TECHNIQUES ARE ALSO DISCUSSED. FOR VOLUMES 1 AND 2 OF THIS SET, DEALING WITH PROCEDURE AND EVIDENCE, SEE NCJ-35159 AND 35160. (AUTHOR ABSTRACT MODIFIED)