The impact of exclusionary discipline on students is clear and negative as we report herein. The impacts of exclusionary discipline have been negatively linked to the academic and social development of disciplined students. We argue that this discipline form has been disproportionately used among certain groups, particularly those students of certain minority and / or ethnic groups, students from lower socio-economic backgrounds, and those students with identified exceptionalities. Exclusionary and zero-tolerance approaches to school discipline are not the best techniques to create a safe climate in contemporary education settings.