You can apply for the exam, and the category of application is "unplanned entrusted training".
2. For details, please refer to the "20 13 Police Professional Degree Postgraduate Admissions Guide" issued by the National Police Professional Degree Postgraduate Education Steering Committee.
3. The initial test subjects and application conditions of police master and law master are different. I suggest you go to official website to check the professional catalogue, and find out the conditions for applying for the exam and the preliminary examination subjects.