False. Ignorance of the law is generally not an acceptable defense, regardless of whether the legal rule in question is a policy or a law.
Policies are sets of guidelines, rules, or principles established by an organization, government agency, or other entity to govern its actions, operations, or conduct. They may or may not have the force of law, depending on the context and the jurisdiction in which they are established. Ignorance of a policy may not excuse a violation of that policy, but the consequences may be less severe than for a violation of a law.
Laws, on the other hand, are legal rules that are formally enacted and enforced by a government or other legal authority. Ignorance of the law is generally not an acceptable defense for violating a law, and may result in penalties such as fines, imprisonment, or other legal sanctions.