8老師， 我弟弟的F1簽證5年期的還有效，這樣能回美嗎？非常著急，謝謝老師。
-Technically, yes, but practically it is very risky and I don't suggest him to leave unless he has no choice. Also, he needs to have the employment verification letter from the employer, just in case. He also needs to talk to the school International Student Office before leaving.
