Lambert v. California
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Facts: The L.A. municipal code said that anybody convicted of a felony entered the city for a period of more than five days, or any felon that entered the city more than five times in a thirty-day period must register with the chief of police. Lambert entered the city without registering and was arrested on an unrelated charge.
Procedural History: D was found guilty of not registering. Fined $250 and placed on probation for 3 years.
Issue: Can a mistake of law defense be valid if the charge is an omission?
Holding: Yes, it can
Reasons: lack of notice
Judgment: Reversed