I have a house that is ~ 4 years old. The master shower walls are tiled, and the base of the shower is a SWAN-S-3442 pan. The pan is made from something they call Veritek. Anyway, the last caulk job on the shower pan was not done well. It held, but looked bad. So, I had a tile guy come out and re-do the caulking and fix any grout that needed it.
He left two areas (one on each side of the door side) of the pan without caulk, and said that those were weep holes (maybe slots). The basic part of what he said was that it allowed better circulation and less mildew. Here are pictures of what I'm talking about:
Thanks