Poisoning food is covered by other laws... You sue the producer for damages... If everyone got together and boycotted say oranges in all forms until the markets produced Non GMO. Then moved on to another product and on and on. Maybe we could change what is offered at the stores.
Generally government regulations simply make it legal for a few and illegal for the rest. Example pollution. Have they stopped it? What they have done is give some industries free passes. The rules that allow some industries to pollute also make it next to impossible to sue that industry for damages. Anyone with a better way to produce maybe with much less or no pollution can't get into the industry because of all the regulations and red tape in place. In the end the very regulations that are meant to protect end up protecting the polluter even from competition.
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