2.21 CONSPIRATOR'S LIABILITY FOR SUBSTANTIVE COUNT is a legal concept which states that a person who has conspired with others to commit a crime can be held legally accountable for the underlying substantive count, even if they did not commit the act itself. This concept is based on the idea that a person may be held responsible for the foreseeable consequence of their actions. There are two types of liability for substantive counts associated with conspiracy: vicarious liability and joint liability. Vicarious liability means that an individual is held responsible for the actions of someone else, whereas joint liability means that all conspirators are treated as a single unit and held equally responsible for the underlying substantive count.