Theft, break and enter, robbery are among these. The Crown prosecutor must prove the defendant intended to commit the crime and any doubt regarding that intent is a defense. Questions arise with respect to the identity of the perpetrator. Did you know that eye witnesses are frequently wrong? Often identifying somebody they saw on another occasion, or relying on racial stereotypes. A judge is required to give a warning to a jury regarding such identification, and police should follow a particular procedure in carrying out a line up identification process. The manner in which the police did the line up may be grounds to reject the subsequent identification by an eye witness.