I've seen it happen before...It's a rural road, dude smoking some weed and throws out the ashes or cleans his weed and throws out the unwanted seeds.
We had a picture in our local paper two years ago of a nearly 2 foot plant growing in a parking lot behind and closed business. Just one plant..sticking up easy to see.
Who the fuck said anything about stealing? I said there is no way anyone planned to grow there. I've had my plants riped before..I wouldn't do that. So calm down dude!