It is not true that any variety can grow out of control.
Tolerance is a natural way of survival of any species.
Before a herbicide-tolerant organism is introduced in the field, it is thoroughly tested for outcrossing possibilities by the regulatory authorities concerned. Also, efforts are made to ensure that the growers are always educated on methods to keep weeds under control. Many people are concerned that if they consume fruits or vegetables that are tolerant to bacteria, it could kill all bacteria in their stomach, harming the digestive process. Reality All over the world, extensive research tests have shown that such an outcome cannot occur. If the gene produced is tolerant to bacteria, the tolerance is very specific to only that bacteria.