Originally recorded Aug 24 as part of the ASAN 2021 Summer Webinar Series, see https://addictionnursing.org/summer for details. Presenter: James L. Ferguson, DO, DFASAM, C-MRO; Medical Director, Recovery Management Services, FSSolutions, Inc; Chalfont, Pennsylvania Learner Objectives: Discuss the matrix differences (Urine, Oral fluid, Hair, Nail). Describe how results from different specimen relate to each other. This presentation is not eligible for Nursing CE.