Introduction: Nurses have important roles in treating criminals. To treat the criminals is complex and it has different challenges. Nurses feel uncomfortable in treating an individual who have injured, raped, and murdered other individuals. They have difficulties to carry out caring principles in such an unsafe and dangerous situation with the risk of physical-attack that could influence their nursing practice and quality. Objective: To explore the nurses' experiences in caring for criminals at the emergency department. Methodology: It is qualitative research with a phenomenological approach. This research was conducted by carrying out in-depth interview of 10 nurses in the emergency department. The applied data analysis technique is the Interpretative Phenomenological Analysis (IPA). Results: The emerging themes in this research are awareness toward the obligation and responsibility as nurses, implementation of caring principle in treating the criminals, and having no intention for the police officers to get involved in the patients' treatment processes. Conclusion: Nurses need to internalize and reflect caring as the philosophy of nursing. It is also important to realize without care, the recovery process and the purpose of giving treatment will not be achieved.