Yep, absolutely. As far as I know they will not let you marry at the Hall without asking you if you have been "clean".
Personally, even though I was an active witness and so was my wife, I insisted on being married somewhere other than the Kingdom Hall. I hate Kingdom Hall weddings and I always have. You have to allow anyone who wants to come, even if they aren't invited. But you wouldn't believe the comments I got and the rumors that went around. Everyone assumed that I was not allowed to get married at the Hall, which was not true. In fact, i did have my uncle who was an elder give our talk, and he even asked me beforehand if we had followed the bible's counsel for courtship (gag).
the worst part is, we had! Looking back, I wish we would have had more fun.