OK here is the deal. The federal government has defined spice and synthetic drugs in a way which would make it illegal even if they changed the ingredients. Each state can adopt the federal schedule to make it illegal by state laws also. Even if those states do not adopt the same standards, it is illegal in federal courts. Most states have adopted the same federal guidelines which makes it illegal both in the federal and state eyes. Some states, I guess Tennessee being one, has not yet done so. It's not difficult to do so if Tennessee wants all spice and synthetic drugs to be illegal they should adopt the same drug schedule that the feds have. It is still not legal in Tennessee to use spice, however until the state adopts the same standards the feds would have to prosecute and they probably won't go after small time users and state laws are not yet enforceable until those states use the federal guidelines.