Safe Checker is a safety diagram system to assess readiness and competency to hold and use firearms. The diagram is easy to use for all ages. Safe Checker measures potential dangers based on the user's mental state, competency, and self-awareness. The diagram also records environment and the user's ability to review hostile environments. Environmental reviews include media, family relationships, friendships, associations, and culture in geographic locations. Users are provided obstacles involving provocation to test mental perseverance against potential psychological threats that may result in violent retaliatory outcomes. Safe Checker is also a training system to develop preventative skills for reducing violent mental health conditions.