A major problem with your argument here is that you are limiting it to the cases of obviously objectionable laws, such as marijuana possession laws and third strike laws applied in the case of a minor, triggering offense. But if "jury nullification" had official sanction, it would mean that any juror would be free to throw a monkey wrench into any criminal trial, merely because he or she "didn't like" the particular law involved.
Juror No. 7 thinks the drunk driving laws are unfair because he feels he was unjustly convicted of DUI a number of years back. He knows the trial he is about to sit on will be a drunk driving case, so he fails to disclose his history on voir dire, just so he can "get back at" The System, by "nullifiying" the law in this particular case.
It doesn't take a genius to see why jury nullification is against the law. And while we're at it, was it you who was claiming that jury nullification is actually provided for in the constitutions of several states? Link, please.
If it's against the law, why aren't people working for
Fully Informed Jury Association being arrested, tried and convicted for obstruction?
They're not, because it isn't.
But hey....You're a sworn officer of the court, so your role is to serve your masters first.
Much like that nut case organization that claims to have a justifiable, legally supportable argument that no one has to pay federal income taxes, the "Fully Informed Jury Association" is misinterpreting various constitutional phrases, case decisions and statutes in an attempt to justify the incorrect conclusion that jury nullification is somehow "recognized" and allowable under our judicial system.
I don't know what has happened, or will happen, to the members of this organization, but I know what will happen to a citizen called to jury duty, who attempts to implement their suggested course of action.