What is this??

Last year I noticed a couple of cannabis plants growing alongside the fence that seperates a golf course and a corn field. There were also more plants on the outside of the woods of the golf course, about 100m away from the other patch. I collected seeds from the plants and planted them this year as a potential guerilla grow. Throughout this whole ordeal my question has been and remains, is this the good stuff or just some hemp left over from the fields of it grown long ago? Below are some pictures of how this patch is doing this year. I've been taking the time to weed out males in order to get some sensimilla.

IMG_1361.jpg This is an overview of the spot by the corn field, along a barbed wire fence.
IMG_1362.jpgThis plant is taller than the corn and smells like skunk.
IMG_1363.jpgsome more of the plants...
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IMG_1373.jpgOne of the plants over the barbed wire fence on the corn field side
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IMG_1379.jpgThe spot by the woods where another tiny patch is growing. These ones are muuuuuuch smaller. At most a foot high.
IMG_1380.jpgCannabis hiding in the brush
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IMG_1386.jpgAnother lone plant along a fence about a mile away
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IMG_1390.jpgMy garden where I planted a bunch of the seeds from last year
IMG_1391.jpgThe plants that I haven't moved from the garden. These ones are pretty small.
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IMG_1396.jpgmy garden
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Thanks for any and all input. And sorry about going a little photo crazy...I just didn't want to leave anything out

I wish I could but I don't have any good genetics going and I don't know anywhere to get some potent pollen.