Considerations of punishment are important with respect to witnesses who have received or been promised benefits from the prosecution such as immunity or leniency. (See e.g., CC 105 and CC 226.) For example, in Giglio v. United States, 405 U.S. 150, 154, 92 S. Ct. 763, 31 L. Ed. 2d 104 (1972), “the Government’s case […]