I don't know about fostering but I know adoption rules require firearms and ammo to be locked up at all times in separate containers (a couple friends of mine applied for adoption and had to go through the whole process including home inspections). I would interpret that to mean you're right about concealed carry and loaded storage being verboten. You might get away with keeping the home defense pistol in a gunvault and the clips in a locked drawer but you'll have to ask.