OOPS NOW I see a problem!
Why in the world would you be doing a grow at a friend's house? First of all, if your friend medicates...you are growing their weed as well. Can yo be absolutely sure your friend will not be tempted to 'help' you grow? Too many chef's will spoil the soup as the saying goes. BUT, what would concern me most is that for every person that knows you are growing...your chance of being discovered by law enforcement authorities increases 20% (statistically speaking) so if 5 people know, I hope your friend looks good in orange! Their home, their garden as far as the cops know, right? Are you willing to step up and take the charge as well? Also, if something happens to your friend OR your friendship you could be S.O.L.
So unless you have a great and valid reason you cannot grow in your own home, and IMHO 'paranoia' does not count. Unless you are a clinically diagnosed paranoid personality. If that is the case and you use cannabis as a method of treatment, I think that is awesome! But I feel you should still responsible for your garden. These days anyone growing the world's most misunderstood and feared plant in a neo-Nazi fascist regime government, is at risk of being put in a privately owned jail.
Well, I am rambling (very medicated!) so PEACE OUT