Dr. mcdonald uses only the testimonies of parents and teachers as support for his treatment of adhd; this illustrates which warning sign of pseudoscience?

This illustrates: Overreliance on anecdotes.

Explanation:

What Dr McDonald is using to validate and support his treatment for ADHD are mearly anecdotes, which are not sufficient enough in the scientific field. To justufy a practice or a treatment a professional should consider a theory that has been accurate and has prove of its results.

Overreliance on anecdotes means putting all the justification of the validity of a treatment, only over people´s testimony.

the telephone is the answer

good question. i'll be looking into that. (this is a joke sir)