An eyewitness identifies John as the perpetrator of a crime that he did not commit. The eyewitness saw John's picture in a local advertisement and has mistakenly replaced the face of the actual perpetrator with John's face when recalling the crime. This demonstrates:

Unconscious transference.

Explanation:

Unconscious transference can be defined

as the mis- identification of someone by using another person to replace them.

Unconscious transference often happen when an eyewitness to a crime scene misidentified or replaced a familiar face from a police lineup because he had seen the face before thinking that it was the perpetrator in which the person is innocent. This often occured due to memory error.

The case of John demonstrate UNCONSCIOUS TRANSFERENCE

corrupt also means cruel