堂兄能办探亲签证么？
这个问题其实是个很简单的移民法法条解释题，但答主们往往忽略了其中最重要的几个关键概念和细节。所以在这里简单解释一下： 首先我们来看问题中提到的美国法律条文，即第8 USC §1182(e)部分：
Inadmissible aliens. (e)(1) Except as otherwise specified， the following classes of aliens are inadmissible... (ii) Aliens convicted of， charged with， or accused of committing acts contrary to law imposed by a foreign nation. (5) The term "alien" means any person not a citizen or national of the United States. 这段法律解释了为什么会被认为“有犯罪前科”。从法律条文中我们可以看出，“被某外国判定犯罪”“被判有罪”“甚至只是被认为犯下罪行”这三者都符合了该条款的定义范围。换言之，如果只以题主所说的事实来断言的话——即使那个国家并没有任何美国认可的司法体系、即使那起案件没有任何证据支撑且最后堂兄也并未被判刑——堂兄仍然被认为是“有犯罪前科”的。因此他无法获得10年居留资格而应该被视为“禁入者”(inadmissible)，而无法入境。
那么，究竟什么才算得上是真正的“犯罪前科”呢？这个问题的答案就相当复杂多了，需要用到美国的很多其他法律去解释。在移民法里，对“犯罪前科”的具体定义可以参见8 CFR Part 212（212c）：
§ 212c. Admissions Inadmissible and Suspicious Character for Immigrant and Nonimmigrant Visas 212c. Admissions Admissible character for immigrant visas， suspension of inadmissibility under section 212(a)(7) of the Act， and other grounds for inadmissibility for nonimmigrants 这一段话直接引用了美国宪法第二修正案里的第八段：
The Act referred to here is actually much simpler than it may seem at first glance; it's basically just an amendment that says “anyone who has ever been deemed a deportable alien shall be considered to have had a criminal record”. So， once again： if you got deported before because of something like that - even without having gone through a court case — then yes， your immigration status will still count as “convicted”， since you were deemed so in the eyes of US Government officials， regardless of what laws were broken. As always， this definition can change over time due to changes to either the Immigration Laws themselves或者the interpretation thereof. For example，some countries no longer consider people with drug convictions immigrable whereas previously they did.
综上，题主的问题已经得到了完整的解答；请参考以上材料，如有疑问再向我或其他人询问 补充一点，根据我的咨询结果，移民局目前不会接受以下情况：
A： 一个完全合法的美国公民因为自己的犯罪行为，导致他的亲戚（非配偶儿女等亲属）在美国申请他/她们的长期居住权被拒签
B： 一个美国公民因为自己的非法行为，比如偷渡，导致他的亲戚在美国申请他/她们的长期居住权被拒签了 所以对于C来说，最好的解决方法还是想办法让D通过正常程序来到美国然后住满五年，这样C就可以拿到长期居住权的申请了