I saw reference in the threads to a structural engineer. Here is a reference from the Texas Professional Engineers web site concerning enforcement of an "expert" as Neil indicates in his thread. Even the experts make mistakes.

I also recall reading about someone acting as a PE on a roofing inspection job for windstorm insurance. The individual didnt even go into the attic.

It was alleged that .... performed an engineering inspection of a residential structure for a client prior to the purchase of a residence in which he opined, without taking elevation measurements, that a slant in the floor was due to an uneven pour of the foundation during construction. After the purchase of the residence, a different professional engineer hired by the client to again inspect the structure determined that considerable differential movement of the foundation had occurred requiring the installation of numerous piers to stabilize the structure. After the repairs, a third professional engineer hired by the client inspected the residence and determined that .... inspection was not sufficient to form an opinion as to degree of differential movement of the foundation. Therefore, .... structural inspection gave a misleading impression regarding the condition of the foundation and his actions indicate he did not act as a faithful agent of his client. The Board accepted a Consent Order signed by .... and his attorney for a Formal Reprimand and the assessment of a $2,640.00 administrative penalty.