This article investigates the role of crime scene technicians in theSwedish criminal justice system, and particularly how Swedishcrime scene technicians not only examine crime scenes but alsofacilitate the criminal justice system’s joint production of forensicevidence. It proposes thinking about the criminal justice system asa conglomeration of epistemic cultures, that is, of communitieswith different ways of producing and understanding forensic evidence.Such a perspective makes it possible to understand interprofessionalfrictions as epistemic frictions as well as to drawattention to the facilitations, mediations and translations thatcrime scene technicians perform. This perspective also makes itpossible to illuminate how the crime scene technicians’ professionalization– a professionalization from the outside – affects boththeir future crime scene work and their facilitations.