Noted: UW-Madison professor of journalism and mass communication Robert Drechsel, who specializes in First Amendment issues, said “restrictions on political calls certainly would raise a free speech issue,” but the federal do-not-call registry does not preclude tougher restrictions by the states. “I would assume that if a state operated its own do-not-call registry, it would be able to let its citizens opt out of receiving whatever types of telemarketing or robocalling it wished,” he said.