In addition, some visa programs, such as the overwhelming majority of visitor visas, will be unaffected by the move to user-pays to ensure there is no impact on tourism.

另外，有些签证类别将不受改为“谁签证谁付费”政策的影响，例如绝大多数旅游签证类别就不受影响，以确保旅游业不受影响。

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It cited statistics from the student and Exchange Visitor Program, a Department of Homeland Security unit that tracks foreigners in the US on student visas and the schools they attend.

数据援引自国土安全部中负责中学生和交流访问者项目的一个部门，这个项目跟踪外国人在美国的学生签证和学习学校的统计数据。

youdao

Yet student visitor visas aren't included - and growing abuse in that category is being ignored.

BBC: Yvette Cooper: End student visitor visa loopholes

In the year to June 2011, a record 1.6 million visitor visas were issued.

BBC: UK border controls - are they tough enough?

"Student visitor visas have fewer checks than full student visas and are therefore ripe for exploitation by those looking to avoid tougher checks, " he added.

BBC: Student visas: UKBA 'failed to check' tip-offs