Kashrus Symbol Question

Anyone know anything about the hechsher of KSA (inside a rectangle), Kosher Supervision Service of America from LA, under Rabbi Abraham Rosenfeld? A frum-owned and run store in Boro Park sold a food item with this hechsher to a friend of mine and she later on realized the hechsher was unfamiliar to her. She asked me if I knew about it, but I never heard of it before, and the store apparently does not take the responsibility for verifying that it is a reliable hechsher. I am bothered altogether that they sell anything that they are not sure is 100% ok, because they are NOT a grocery, so this food item (might be a spice, for example) does not NEED to be sold there at all. They primarily sell home goods.