I think that this already happened since we are cloning animals way a long time ago. All these experiments occur and if they have a positive result then they are shown on the public light but if the public opinion doesn't like the idea then the labs or the government would not share anything
Very right. I believe so too. First of all secret Gov projects do not really need the public opinion. They would already have done that to actual humans.
Perhaps like what we see in movie Bourne Legacy. Meds that permanently alter the capacity of human physiques and cognitive enhancements... are probably real and tested already.
Much like how advanced mobile technology were actually existed at least 3 decade before public get hold of them.