Professional socialization is known as the study of how newly trained professionals integrate their chosen profession and its most dominant cultural traits. Generally, professional socialization studies rely on the testimonies of those more or less experienced in the profession who had lived through such a process. Researching and documenting professional socialization processes while they occur, are nonetheless rare. And it is even less frequent that such endeavors have been replicated in two different countries for one same profession. In this article present research conducted in France and Quebec on the professionalization of police recruits. Both studies use equivalent questionnaires and procedures and were conducted within a ten years time span. Analysing and comparing the two studies at equivalent moments will give the readers glimpses at more or less generic processes, while also enlighten the differences attributable to the specific professional contexts within which socialization occurs.