Reasonable Doubt: There is a pot farm on my property

marihuanaA friend of a reader owns a very large rural property. The whole property is not visible from the house and long periods of time will pass during which parts of it will go unobserved. One fall day, he decides to go for a walk on his property with his girlfriend. Far at the back of the property, an area not often visited, he comes across what used to be a large crop of marijuana. It had been harvested, but there was still a lot left. What should he do?