I watched the video of you in the interview room (well I skipped the bits I've heard repeated verbatim a dozen times before before, which was most of it) and I'd say the key take-home message of it is that you started the interview in police custody and, after lots of mumbo-jumbo, you were still in police custody. The only thing you've done is confirm for the record that you were growing cannabis. This is what we call a zero sum gain.
Even if you people are right about all this stuff, you're not of course but even if you were, do you really think that the justice system will allow itself to be derailed so easily? It's not a question of who is in the right, it's a question of who is in control. They are in control, you are not. If they want to put you in prison they will do so.
People talk about 'common law' as if there was once a set of laws created by and for the common man, and that these were usurped by corporate laws which only apply to those who are somehow tricked into submitting to them. First of all, no hierarchical society would allow the plebs to decide what the laws are. Since long before there were paper and pens to write laws down with society has been hierarchical. Secondly, no ruler or government would create laws which only work on an opt-in basis, because if people were willing to voluntarily do as they were told there would be no need to draft laws in the first place.
Yes it would be lovely if you could get caught with a flat full of hydroponics and talk your way out of it. Yes it would be nice to score some points against the people who control our lives. Yes it's nice to think about some mythical time in the distant past when the only laws were about not murdering people and not talking in the cinema once the movie's started. Sadly wanting these things to be true doesn't make it so, as even a little bit of research outside of the freemen circle-jerk will soon reveal.
The best way to avoid the long arm of the law has always been the same: don't get caught.