I cannot speak for all companies but we test all of our sticks dry, then we pull out a spray bottle and spray the stick with mist from end to end and test them again. All sticks have to pass both tests once a year. Assuming the sticks have been taken care of and cleaned and waxed regulary we rarely have a stick fail a dry test. We have had several sticks that have failed the wet test over the years and have had to be chemically cleaned and re-finished. Most of the time we can tell when they will fail a wet test before we every put voltage to them because the water stops "beading" on the stick. If the water beads they pass, if water doesn't bead they will usually fail.