Look at the shift in law over time, which should be evidence enough. For instance, from Bowers v. Hardwick to Lawrence v. Texas, or Roe v Wade to Planned Paren

Look at the shift in law over time, which should be evidence enough. For instance, from Bowers v. Hardwick to Lawrence v. Texas, or Roe v Wade to Planned Parenthood v. Casey, in < 20 years. As I said, it is usually the case that precedent is distinguished into oblivion rather than explicitly overruled. Only very limited technical issues are "settled law".