somebody was just messing with your friend who that happened too because anyone can have a police business card... i got 3 from bein on probation

Almost everyone with experience would agree that 5-6 isn't worth the cops time. Make sure you don't leave any giveaway though because they CAN follow on leads like a cup with fingerprints or a footprint BUT they usually wont. And you want to spread out your plant so it's harder for cops and other people to find.

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It depends more on where you live. If it is an area know for growing then yea 6 plants aint shit, but if you are in a place not know for it or have a really small know nothing backwoods PD then they might wait for you just so they can add a grow op bust to their rep.

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A democracy is nothing more than mob rule, where fifty-one percent of the people may take away the rights of the other forty-nine.
Thomas Jefferson

I would be all over the local papers...

"I was hiking one day and came across some pot plants in the woods...the plants had a card attached. It was the local PD growing them! Look, I even took a picture. Why would the local cops grow pot plants?"