Our research team, which includes experts in suicide prevention, LMC, evaluation science, qualitative research, adolescent mental health, and emergency medicine, is well-suited to rigorously evaluate the study aims using a mixed-methods approach. Our five hospital sites will collaborate with study personnel to: a) establish IRB procedures and approvals, b) develop a system (in nearly all sites via the electronic medical record) to flag eligible patients, document provision of intervention services, and provide parent contact information to the study team, c) require the clinicians who will provide LMC to take the online training during their sites' two-week phase-in period, d) host an in-person training with a study investigator at a staff meeting during the phase-in period, and e) implement the new lethal means counseling protocol on their start date. A lead ED clinician at each site will be the point of contact to help manage logistics and access medical record information for the study in accordance with HIPAA regulations. The Colorado-based project coordinator (Brandspigel) will work with hospitals to develop site-specific consent and data transfer processes.