How to distinguish official police and cooperative police from alarm numbers?

You can see that the badge says "Shandong" (and other provinces and municipalities directly under the Central Government) or "railway" or "traffic" or "forest" or "civil aviation" (public security in four industries), and the badge of security guards generally says "security" or "public security" or "co-management". Second, look at the epaulettes, the police are standard police titles, and the epaulettes of security guards are worse; Third, read the alarm. The police alarm number is six digits without letters, and the security number generally has letters. . Fourth, look at the armband. The police armband says "police" or "special police", and the security guard usually says "public security" or "auxiliary police" or "security guard".