I was amused by this news article about a Kansas couple who got raided possibly just because they bought some hydroponics supplies. The police swarmed in to find a few tomato and squash plants.
I'm glad I'm not the only plant geek who has played with hydroponics just because it seemed like a fun idea. In college a friend helped me engineer a windowsill hydroponics unit. I used it to grow houseplants. That's all. Really.