Please note that it is the policy of Children's National Hospital to ensure a "drug-free" work environment: a workplace free from the illegal use, possession or distribution of controlled substances (as defined in the Controlled Substances Act), or the misuse of legal substances, by all staff (management, employees and contractors). These include the Heart and Kidney Unit, Short Stay Unit, Medical Surgical Units, Level IV NICU, PICU, Cardiac ICU, Emergency Department, and critical care transport via ambulance and helicopter and other units.