Police station. According to this question, the proof of political examination materials is a record to prove whether the person under examination has a criminal record or participates in a cult organization. First, the local village committee or neighborhood committee will issue a certificate, and then I will go directly to the local police station with the certificate and ID card. According to this problem, we know that the materials of political examination for joining the Party include my history, main family members, main social relations, application for joining the Party, training, inspection and actual performance of the Party organization.