Go on and let your guard down, dont worry, no one cares about someone growing a little ganja anyway, right? Ill agree that research is king, but implying that its all just propaganda, is a pretty narrow opinion. Turn on a TV and watch as eradication teams go out and locate grows in National Parks and rural land then haul it out by cargo nets. watch that on your local news, not youtube.
Sure police use propaganda (not as a defense though) they'd love it if you were too scared to try anything illegal. But dont be naive, technology exists that would blow your mind. Just be lucky we have the bill of rights, and that a warrant is required to target a specific property with (most of) these capabilities. But if you get their attention and they want to know whats going on behind your doors, if they really want to know, they will.