Have you ever been in the produce department, and it's not clear from the signage whether what you're looking at is organic or not? It happens to me from time to time. Not a life threatening situation, but annoying at times, particularly if I'm in a rush.Most produce these days comes with little sticky tags that have a product code. The checkout clerks sometimes key in these numbers to identify the product.
It turns out that the numbers on the tags typically come in two flavors: 4 and 5 digits. The 5 digit numbers signify organic produce.
A good thing to keep in mind when it's not clear whether the apple you're looking at is indeed the pesticide-free version.