When shopping for produce, how do you know if you're consuming GMOs if it's not labeled? There are a few tricks. The "Price Look-Up code", or the "PLU code", gives you some vital information. The numbers within the PLU code are one way to identify conventionally-grown produce versus genetically-modified (GMO), as well as organic produce.
The 4-digit codes are conventionally-grown, and the 5-digit codes are either genetically-modified or organic.
The prefix of '8' would be placed in front of the 4-digit code for genetically-modified (GMO) produce (example: "84321"), and the prefix of '9' would be placed in front of the 4-digit code for organic produce (example: "94321"). Conventionally-grown produce may have PLU codes between the numbers of 3000 and 4000.
When in doubt, always choose the 9! :)