Hey man.. most cops are good people.. they just deal with 95% bad people all the time and it can make them grumpy.. and easy for them to confuse you as a bad person since you are braking one of their laws..

just be respectful and stern with them.. and if all possible dont answer the freakn door!! They cant provide evidence to a judge to get a search warrant because you didnt answer the door.. but the second you open the door they can say they smell pot (even if they dont) or that you acted in a suspicious manner.. which might be enough..

Remeber.. cops are like the rest of us.. LAZY.. if you never open the door they will go to the next name on the list that someone gave them.. and who knows.. it could have been some fool that got busted went searching the internet for other growers to roll on.. it wouldnt be hard to do that you know.. Anyways.. Just CYA