If laws were broken, justice should be served. In Africa, the hunter has very little control over the details and how a hunt takes place. Hunts, licenses, dates, areas and often specific animals to be taken are tightly controlled by the Professional Hunters (outfitter/guide) and land owners. Its possible the dentist may have known what was going on but its very plausible that he figured everything was by the book. I haven't read all the details yet.
African lions are not an endangered species.