( July 28, 2026, 11:17 AM EDT) -- COLUMBIA, S.C. — Parties in a proposed class action over the alleged polychlorinated biphenyl (PCB) contamination of a lake briefed a federal judge in South Carolina over whether an expert industrial hygienist’s use of artificial intelligence produced fake citations that form the basis of his opinion or whether he merely used the technology appropriately to summarize documents and can account for all references on which he relied....