Why is GMO banned?

Could you please explain to me the reasons behind the ban on genetically modified organisms (GMOs)? I'm curious about the specific concerns and arguments that led to this decision. Are there health risks associated with GMOs? Or is it more about environmental impact and sustainability? I'm also interested in knowing if there are any exceptions or specific cases where GMOs are still allowed? Could you elaborate on the science and policy considerations behind this ban? Thank you for your insights.