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The supplies you purchased, along with the calls to the grower that was arrested would probably be enough. However, I suspect that the "grower" that was arrested also snitched you out, but they didn't put that in the warrant. Just a hunch of course. But, you can fight it, it isn't the strongest case for probable cause I have ever heard.
What if I'm certain the other grower didn't snitch me out? He was the main focus of the investagation, friend for 30 years, he's still in jail for conspiracy(along with 2 others on his warrant).
Well, as I said you can fight the warrant, but friend for 30 years or not, if he is looking at conspiracy, I would be suspicious. Also, they could have had his house wired if he was the focus of the investigation and heard your calls. That wasn't in the warrant, of course. If you had another legitimate reason for growing things, that's what I would use as the defense. Fighting the warrant never hurts, and you might as well give it a shot.