However, there are issues with Lombroso’s research, it was pooryly controlled as he did not compare his sample of criminals with a control group. Therefore the atavistic features he claimed to be linked to crime could have been just as prevelant in the non criminal population. A further criticism is that there could be other causes of these facial and cranial features aside from just criminality, for example poverty or poor diet. This challenges the validity fo Lombroso’s research