I think he's saying that his fiancé started 6 months of DOT at St. Luke's - they give sputum culture results every 3 months during the process - the results for this particular sample was clear.
My wife went through this process, but her experience likely won't line up with your fiancé, for several different reasons. It's been a while, so the details are fuzzy, but I recall St. Luke's having her come in about a month after her treatment ended for a follow-up. During the follow-up, they automatically scheduled another medical. So, I would expect about a 1 - 2 months after DOT before you can safely schedule an interview at USEM. Then again, my wife went through this during the height of the pandemic, so the timeline might have been affected by that.
