Right livelihood with modern (potentially dangerous) products
Buddhism is not about following set rules. Monks have 227 rules &amp;, if you have ever lived with monks, you will notice certain monks trying to find loop holes to circumvent the rules (rather than live according to the spirit, purpose &amp; essence of the rules). 

The matter of right liveihood is something you must decide for yourself according to your spiritual conscience. While the scriptures list 5 kinds of wrong livelihood (trading in weapons, human beings, meat, intoxicants &amp; poisons), there are many other jobs you may chose not to do due to their lack of ethicalness. If you personally find fault in GM foods, best you not work in that industry.