After graduating from college, you can take an examination of civil servants (forensic positions in public security bureaus and procuratorates) or recruit police. At present, most provinces require forensic medicine majors or medical (clinical) majors to recruit forensic doctors.
But there are some things to remind you that forensic doctors are really hard, not as beautiful as the legend, and the salaries of forensic doctors in public security and procuratorate are also very small, far less than that of clinicians. Therefore, if you are determined to be a forensic doctor, I suggest that you study clinical medicine in a university (at least undergraduate) and become a clinician if you change your mind in the future. On the other hand, this scientific forensic doctor must have some advantages, that is, to find a job (here, not to test civil servants, but to test forensic positions in civil servants). In fact, as long as they meet the requirements for registration, the competition between the two majors is not much different. It is relatively easy for undergraduate forensic doctors to find jobs, such as social appraisal institutions, but the salary will not be very high. It is relatively difficult to find a job in undergraduate clinical practice, even for a master's degree in a general 3A hospital.
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