From the Facebook page: The Board for Certification of Genealogists shares case studies and reports to help other genealogists learn from the example. Here's one from LaBrenda Garrett-Nelson, JD, LLM, CG, CGL. The link will take you to a PDF on the BCG website. The case study is titled “Parents for Isaac Garrett of Laurens County, South Carolina: DNA Corroborates Oral Tradition.”
It was originally published in the National Genealogical Society Quarterly 108 (June 2020): 85–112.