This is the first of four chapters that consider intersecting cultures and practices within the justice system. This chapter explores the pervasive influence of subjective cultures, defined by normative beliefs and shared behavioural expectations, within the justice system. We examine how cognitive and social biases, as products of a dynamic interplay between societal and organisational levels, present a risk at every stage of the criminal justice process. Our analysis explores specific manifestations of bias in policing, prosecutorial impartiality challenges, and the susceptibility of judges and forensic experts to both cognitive and implicit social biases. The chapter highlights the association of tunnel vision with wrongful convictions and its impact on defence, policing, and prosecutorial practices. Finally, we identify the critical role of racism and racial bias as significant contributors to over-representation within the Australian criminal justice system and wrongful convictions.