Professor Freidman the Great Confrontationist has posted the Petitioner’s Brief and Appendix for Williams v. Illinois. This case is one of several we should be following that will come from the Supremes. This issue presented in Williams is:
Whether the prosecution violates the Confrontation Clause when it presents, pursuant to a state rule of evidence, the substance of a testimonial forensic laboratory report through the trial testimony of an expert witness who took no part in the reported forensic analysis, where the defendant had no opportunity to confront the analysts who authored the report.
Scroll down on his page and you’ll find initial thoughts on Williams. SCOTUSBlog has the case “file.”