However, a major limitation of this definition is that Psychopaths can cause great harm and yet still appear normal. For example H. Shipman an English doctor murdered approximately 215 of his patients over 23 years, but seemed to be a respectable doctor as he: maintained a job, personal hygiene and interpersonal relationships as he was married. Whilst he was clearly abnormal, he did not display any features of the criteria for FFA and so according to this definition he would seem normal.