Qui Tam Lawyers for False Claims Act Whistleblowers. Based in Washington, D.C., Vogel, Slade & Goldstein, LLP is one of the nation's longest-standing qui tam law firms representing whistleblowers in lawsuits under the False Claims Act. VS&G qui tam lawyers have the highest success rate nationwide for achieving monetary awards for their whistleblower clients, as reported in a study of over 4,000 qui tam case outcomes. The firm also has the highest reported success rate nationwide in persuading the United States to join its clients' qui tam lawsuits.