What is an official prerequisite for a crime? means that actus reus and mens rea need to be present simultaneously at the time of the crime for it to be deemed a crime.

Concurrence.

Explanation:

In criminal law, concurrence is the prerequisite that a wrongful act and a wrongful state of mind should take place simultaneously in order for a crime to be legally termed as crime.

In order for prosecutors to convict a person of a crime, concurrence is taken into account. The law observes that actus reus (guilty act) and mens rea (guilty mind) coincide with one another during the act of crime.

If actus reus and mens rea occur in concurrence, the law will deemed it as a true and intentional crime.