Outside the Sacramento County elections office supporters gathered to turn in signatures.
Kelly Quirke with the California Right to Know campaign says most Californians want to know if food contains genetically modified ingredients.
QUIRKE: "Right now we are polling at over 90 percent, positive feedback, people who are for this bill in the state of California."
But Meghan Callahan with the opposition campaign says implementing the law would be a logistical nightmare for farmers and grocers.
CALLAHAN: To have to set up separate distributions, separate labeling processes, and these are going to increase costs, and the people who are going to pay those costs are going to be California consumers."
SCOTT: "We just see this as creating huge potential for more lawsuits-- and the reason being is that in this initiative, in the enforcement section it allows for any individual to bring suit."
If the measure qualifies, it will appear on the November ballot.