Like Zenas, I'm from Kentucky, and reared in Tennessee. My own experience is the same as Zenas. Everywhere I'm familiar, the church will vote on candidates for baptism, who will become members upon their baptism. If something happens in between the vote and the dunking--it's all off.
Now, in the case of transfer of membership, candidates are voted on "on promise of a letter" from a congregation of like faith and order. Again, if we don't get the letter, it's all off.
Another way we receive members is "by statement." In a case where records have been lost, or the previous church has gone belly up, or something like that, a candidate will state that they have been scripturally baptized in a church of like faith and order. We usually take them at their word and vote them in.
Frankly, it's my personal opinion (a minority view in my church) that we are much too quick on the trigger. We need to guard the doors of our church a bit better.