Because the armed police is composed of internal security, gold, forest, water and electricity, transportation, border defense, fire control and security forces. My father is one of them.

Therefore, border defense is one of the departments, mainly responsible for border patrol and inspection. People's police do not apply to borders.

Moreover, once the bad guys (smugglers, smugglers, etc. ) have met, because the armed police belong to the military category and can immediately fight back or arrest.