Simple English definitions for legal terms
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Impossibility means that something cannot be done or completed. In law, it can be used as a defense to avoid punishment or to excuse someone from doing something they promised to do. For example, if someone promised to clean a theater for a year but the theater burned down, they cannot be expected to continue cleaning it. In criminal law, if someone tries to do something that is not actually a crime, they cannot be punished for it. But if they try to do something that is impossible to do, like fly without wings, that is not a defense.
Impossibility is a defense used in criminal and contract law. It excuses a person from liability or non-performance when an unforeseen event occurs that makes it impossible to fulfill their obligations.
Under contract law, impossibility can be used as a defense when an unforeseen event occurs after the contract is made that makes performance impossible. For example, if a person agrees to clean a theater for a year but the theater burns down, the person is excused from performing the rest of the contract because the contract was based on the theater's existence.
Under criminal law, impossibility is a defense in some jurisdictions that can remove liability for certain attempted crimes. There are two types of impossibility:
These examples illustrate how impossibility can be used as a defense in both contract and criminal law. In contract law, the unforeseen event (the theater burning down) made it impossible for the person to fulfill their obligation. In criminal law, legal impossibility (the undercover officer not actually selling drugs) means that the person did not actually commit a crime.