Mens rea refers to the guilty intention, knowledge, or state of mind of an accused in committing a crime. It has come to fore as an indispensable element of crime in tune with a Latin maxim which means, “there can be no crime without a guilty mind” (actus non facit reum, nisi mens sit rea).
An act done by a person becomes a crime only when it is done with a guilty intention or mental state, in normal course. In other words, an act done with absolutely no guilty intention or state of mind may not become a crime.