-4 October 2012 Last updated at 20:28 ET
California battle over GM labels
By Matt McGrath Science reporter, BBC World Service
Supermarket Food labelling remains a complex and divisive issue in the United States
Voters in California will decide on a proposal next month that would require the labelling of most foods made with genetically modified ingredients.
Proposition 37 is supported by the organic industry but many major food suppliers oppose it saying it will drive up prices.
Around $40m is expected to be spent on campaigning with the majority coming from opponents.
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