Final answer:
Former crimes can be introduced under the Criminal Evidence Code if they are relevant to prove motive, opportunity, intent, and other specific factors, adhering to the provisions of the Fifth Amendment which protect individuals from Double Jeopardy.
Step-by-step explanation:
The instances of former crimes that the prosecution can introduce under the Criminal Evidence Code are related to the Double Jeopardy clause of the Fifth Amendment, which is one of the many protections offered to individuals accused of crimes. This protection ensures that once a person is found not guilty of a crime, they cannot be tried again for the same crime even if new evidence emerges. However, this protection does not apply if there was a hung jury or if the defendant was found guilty and is appealing the verdict. In general, previous crimes or 'bad acts' are not admissible to prove the character of a person in order to show action in conformity with the character or trait on a particular occasion. There are exceptions, such as when such evidence is relevant to prove motive, opportunity, intent, preparation, plan, knowledge, identity, absence of mistake, or lack of accident.