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§ 566.020 RSMo – Mistake of Age or Consent Not a Defense

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Posted by Christopher Combs on July 21, 2025

566.020. Mistake as to age — consent not a defense, when.

Thinking a child is older is usually not a defense in sex crime cases

In a sex crime case in Missouri, if a child is under 14, the law doesn’t allow a defense based on mistaken age or consent. For children under 17, there may be limited exceptions.

1. If the crime involves a child under 14, it is not a defense that the defendant believed the child was older.

2. If the crime involves a child under 17, the defendant may claim as a defense that they reasonably believed the child was 17 or older.

3. A child under 14 cannot legally consent, so consent is not a defense to any charge under this chapter if the alleged victim is under 14.

View the full statute here

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