Through examination at control points and the vetting of visa applications,undesirable persons including international criminals and terrorists,are detected and denied entry.

• 入境事务人员在各管制站向旅客执行出入境检查，审核签证申请，查出各类不受欢迎人物，如国际罪犯及恐怖分子，并拒绝让他们入境。