We are contemplating a little bathroom remodel including inset medicine cabinets. When I last did any work in this bath about six years ago, I recall that at least one of the spots for the recessed cabinets has a vent pipe running through it vertically. Fortunately, it is a non load bearing wall, so I have pretty much a free hand.
In general, is it permissible to re-route the pipe around the cabinet (it probably would take four nineties to do so...). If not, what problem would that type of re routing generate?