We get this question all the time: should bilingual doctors be tested for their language skills? The idea behind testing is to be sure these doctors are safe to provide services in another language. (The same questions applies to other bilingual providers—such as police officers, call center staff, social workers, therapists…)
We who work in the field know the answer. Research bears us out. Here are two studies, one from Seattle, Washington, the other based on subjects in Oregon and Massachusetts.
A great resource (or two!) to share!