In a blow to private property rights, the Supreme Court has ruled 5-4 that people's homes and businesses may be seized for private, profit-making development. The Court argues that this constitutes "public use."
I guess that if you're growing medical marijuana, the government can confiscate it, and your land, too.
Update: Eugene Volokh has thoughts on the ruling, and there is an interesting discussion in the comments to his post. My fear echoes one of the commenters: What is to prevent a business from lobbying the government to seize private land for the use of the business if the government can merely justify its action by claiming that it results in a public benefit?