This webinar provides an overview of the National Institute of Justice’s (NIJ’s) and National Institute of Standards and Technology’s (NIST’s) Direct Analysis in Real Time Mass Spectrometry (DART-MS) Data Interpretation Tool (DIT). The presenters discuss how to use the NIST/NIJ DART-MS DIT, how to use the Library Search Algorithm function, and other resources available for implementing DART-MS in laboratories.