Aubrey Strode's case was built on testimony from uniquely qualified witnesses. There were teachers who had observed the Buck family in school, and there were social workers from welfare agencies who had monitored similar problem families in the community. Strode even called several neighbors of the Buck family to show how ordinary people viewed the Bucks. But the most important witnesses were the experts, each with the title of "Doctor," all well versed in eugenic theory. Two medical doctors who ran the asylums for the defective took the stand, and two eugenic scientists--authorities from out of the state--added their opinions on the workings of heredity and the threat posed by girls like Carrie Buck.
"Carrie Buck Trial Transcript, 51-100" (2009). Buck v Bell Documents. Paper 32.