Ahh, Dave, where is your engineering gone to? Once something is distilled to numbers, there is no leeway for arguement. If Scott's says their bag of fert is 18-4-4, they better be able to stand behind those numbers. A friend in the biz years ago took delivery of a liquid fert one year. He was not happy with results, so he sent a sample to be tested in a private lab. When the test showed that NPK were not as labeled, the seller gladly refunded the full price and costs to my friend, rather than deal with state enforcement. At least in IN, the stated NPK numbers (and others, if so labeled) are considered MINIMUMS, and must be listed as whole numbers (some trace elements can be fractional). You can be a little over, but you better not be under. And there's no reason any organic should be exempted - as you note, you'd just open doors wide to the unscrupulous operators.