I find that if you speak convincingly about some of your past projects, interactions with dealing with inspectors and knowing your rights. The students see you as a individual that may or may not have faults? You though are helping them to understand real world ethic's and what can happen when you don't hold up your personal emphases on quality and delevering your product. The students then can help to place themselves into the situations and know that they can relate to a real life circumstances. This help everyone feel that they could open up and relate to class after hearing personal stories.