U.S. House Judiciary Chairman John Conyers (D-Mich.) penned a letter to the DEA requesting answers about the agency's raids of and threats to California’s state-legal medical marijuana facilities. The letter, sent in April at the request of several concerned public officials in California, asked the DEA pointed questions regarding the cost of these raids and whether attacking medical marijuana providers was a sensible use of scarce resources. The DEA has finally replied. And, as expected, the 17-page…