@careful
darkspilver has it spot on.
Yes you offer a BS to inactives (under the service committee's direction) but if it's been more than about six months inactive they get the loyalty test usually dressed up as loving concern and usually based on what an unbaptised publisher gets asked (not the full baptism Q's).
However if Dave the drifter tells his study conductor he's done anything "serious" (ranging from smoking/bashing the bishop to porn etc. through celebrating Xmas/Hallowe'en and/or rogering half the University College cheerleading team all the way up to disbelieving 1914 was the start of the Gentile times or saying Stephen Lett acts and looks like a rubber faced clown) then he get's dealt with judicially and if "unrepentant" can find himself out on his ear with an unwanted DF around his neck.