
Originally Posted by
Kellanved
Actually no, it cannot be stressed enough that in law, words and terms have specific legal significance, often beyond their ordinary meaning.
In this specific instance, you’re not talking about a mistake of fact defense. What you’re doing is questioning the validity of a search and seizure presumably in order to suppress incriminating evidence (no evidence, no case after all)
A mistake of fact is a defense, claimed by the defendant; the mistake is on the part of the defendant not the prosecution or some third party. A mistake of a fact is a defense where a specific mental state is required for the offense charged. (generally in the case of possession the mens rea (mental state) is knowledge – see the model penal code) The mistake of fact needs only be in good faith, it needs not be reasonable.
Briefly stated, there are two components to a crime, 1. the actus reus (the act requirement) and 2. mens rea (the mental state). The reason why mistake of fact is a defense is because the mistake of fact negates the required mental state of the offense, therefore there is no crime.