Which scenario represents a clear ethics violation under the NCEES Model Rules?

The scenario involving the civil engineer signing plans for a project outside of their expertise represents a clear ethics violation under the NCEES Model Rules because it directly contravenes the fundamental principle of competence. Engineers are required to engage only in work for which they are qualified through education and experience. Signing plans for projects that fall outside their area of expertise can lead to substandard work, safety risks, and potential harm, which undermines the integrity of the engineering profession and can jeopardize public safety. This violation emphasizes the importance of ensuring that professional activities are conducted within the boundaries of the engineer's knowledge and skills. It highlights the ethical obligation to maintain professional standards and safeguard the welfare of the public.

In contrast, the other scenarios, like working on a side project or trading stocks, may not necessarily indicate an ethics violation unless they involve conflicts of interest or misuse of professional knowledge. The key distinction lies in the professional competence and the potential consequences of deviating from recognized standards in engineering practice.