It's mostly from the following two schools, it seems to be required for UMaryland; for Stony Brook, I was hoping to find specifications for "previous coursework in both developmental and social psychology":
University of Maryland (https://psyc.umd.edu/graduate/frequently-asked-questions-(faq): Is the GRE subject test in Psychology mandatory?The subject test is recommended, but it is not required. If you are applying to the Clinical Psychology program however, the GRE Psychology Subject Test must be taken by the end of the first year in the Clinical Psychology Graduate Program. Therefore, the Clinical Psychology Graduate Program highly recommends taking the GRE Psychology Subject Test before applying or before the start of students' first year in the program (Clinical Psychology Only).
Stony Brook (https://www.stonybrook.edu/commcms/psychology/graduate/admission_requirements: Psychology GRE Test for Clinical Psychology Admissions: APA accreditation requires all Clinical Psychology doctoral students to demonstrate entry-level knowledge in major domains of psychological science. To meet these requirements, admitted students to the Clinical Psychology program must have either completed (a) previous coursework in both developmental and social psychology with a grade of B or better, or (b) achieved a score of 70th percentile or higher on the Psychology GRE Test. There is no Psychology GRE Test requirement to apply to the Clinical Psychology program, but admitted applicants are expected to complete these benchmarks prior to entrance into the program.