Yes, in fact we once disfellowshipped a guy that was DF'ed again earlier. The first time was (I think) for smoking and maybe premarital sex; the second was for admitting having sex with his wife before they were married.
Oh god, now that I recall this stuff... What on earth was I doing, meddling with other peoples private lives?
(Everyone that has played as an elder the role of Inquisitor in a JC, will always feel a burden of guilt and sorrow upon him, even long after he wakes up.)