What is the current state of the law on cross-examining in criminal cases?

trial process.'" Michigan v. Lucas, 500 U.S. 145, 149, 111 S.Ct. 1743, 114 L.Ed.2d 205 (1991) (quoting Rock v. Arkansas, 483 U.S. 44, 55, 107 S.Ct. 2704, 97 L.Ed.2d 37 (1987)). "'[T]rial judges retain wide latitude' to limit reasonably a criminal defendant's right to cross-examine a witness 'based on concerns about, among other things, harassment, prejudice, confusion of the issues, the witness' safety, or interrogation that is repetitive or only marginally relevant.'" Id. (quoting Van Arsdall, 475 U.S. at 679, 106 S.Ct. 1431). However, "[r]estrictions on a criminal defendant's rights to confront adverse witnesses and to present evidence 'may not be arbitrary or disproportionate to the purposes they are designed to serve.'" Id. at 151, 111 S.Ct. 1743 (quoting Rock, 483 U.S. at 56, 107 S.Ct. 2704).

3. Analysis.