我母亲来美的时候，入境时给的I-94卡上只有一个B2的盖章，但没有注明离境日期。当天我就打电话去海关问，接电话的人员说没有关系，B2就是有六个月的滞留期。
记得以前入境，I-94卡上总是注明必须离境的日期。这次为什么没有离境日期，难道程序有所改动吗？大家有没有碰到类似的情况？谢谢！
-I think the CBP officer forgot to indicate the duration in the I-94 card. Your mother may go to the local CBP Deferred Inspection Office or any port of entry to fix it.
Find the CBP Deferred Inspection Office and the port of entry at these websites:
http://www.cbp.gov/xp/cgov/toolbox/contacts/cmcs/
http://www.cbp.gov/xp/cgov/toolbox/contacts/ports/
