At Deut 17:6 the law is given that states that for the death penalty to be imposed on someone guilty of a capital offence, there have to be 2 or 3 witnesses to the crime. If there weren't at least 2 witnesses then no conviction could be made and therefore no punishment meted out to the offender.
Consider the following scenario: An Israelite girl is being sexually abused by her Israelite father ( incest was a capital offence under the Mosaic law - Leviticus 18:6,29 ). She approaches the city elders and tells them what her father is doing to her. They summon her father and ask him if the allegations are true. He denies it. As there aren't at least 2 witnesses to the crimes, the father is left unconvicted and unpunished. The outcome for the girl? She goes home and continues to be abused by her father. Does the Bible's '2 or 3 witnesses' rule give evidence of divine inspiration?