Are there any problems for B2 visa reentering?

My in laws will be back to US in March and their visa will be expired in April. So, are there any problems for them to reenter? Will the VO ask them why they come back?
Thank you!

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理论上讲你父母在签证的有效期内进入美国没有任何问题。 -红叶- 给 红叶 发送悄悄话 (64 bytes) () 10/24/2008 postreply 20:09:01

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