A Pennsylvania judge on Tuesday drastically reduced a $2.25 billion verdict against Bayer AG (OTC:BAYRY), cutting it down to $400 million in a case involving a man who claimed he developed cancer from using the company’s Roundup weedkiller. The jury in the Philadelphia Court of Common Pleas had initially awarded John McKivison $250 million in compensatory damages and $2 billion in punitive damages, finding that his non-Hodgkin’s lymphoma was caused by long-term use of Roundup at his home. However, Judge Susan Schulman later adjusted the damages to $50 million in compensatory and $350 million i…