(b) Every person who attempts by force or threat of force or by the use of fraud to induce any person to give false testimony or withhold true testimony or to give false material information pertaining to a crime to, or withhold true material information pertaining to a crime from, a law enforcement official is guilty of a felony, punishable by imprisonment pursuant to subdivision (h) of Section 1170 for two, three, or four years.

As used in this subdivision, “threat of force” means a credible threat of unlawful injury to any person or damage to the property of another which is communicated to a person for the purpose of inducing him to give false testimony or withhold true testimony or to give false material information pertaining to a crime to, or to withhold true material information pertaining to a crime from, a law enforcement official.