The case is Smith v. Chrysler Group (5th Cir. 11/26/2018), http://www.ca5.uscourts.gov/opinions/pub/17/17-40901-CV0.pdf. The opinion concisely summarizes the facts as follows:
Many states require the plaintiff’s expert in a medical malpractice case to be board certified in the same specialty as the defendant. The dire consequence of an attorney’s failure to meet this requirement precisely was recently demonstrated in Shadrick v. Grana (https://acis.alabama.gov/displaydocs.cfm?no=907441&event=5BT0M4P9Y).