of certification, reflecting levels of training and skill, but these too were, for the most part, purely local. To clarify, at least at a national level, the National Highway Traffic Safety Administration (NHTSA), which is the federal organization with authority to administer the EMS system, defines the various titles given to prehospital medical workers based on the level of care they provide. They are EMT-P (Paramedic), EMT-I (Intermediate), EMT-B (Basic), and First Responders. While providers at all levels are considered emergency medical technicians, the term "paramedic" is most properly used in the United States to refer only to those providers who are EMT-P's. Apart from this distinction, the only truly common trend that would evolve was the relatively universal acceptance of the term 'emergency medical technician' being used to denote a lower level of training and skill than a 'paramedic'. Changes in procedures also included the manner in which the work of paramedics was overseen and managed. In the earliest days of the field, medical control and oversight was direct and immediate, with paramedics calling into a local hospital and receiving orders for every individual procedure or drug. This still occurs in some jurisdictions, but is becoming very rare. As physicians began to build a bond of trust with paramedics, and experience in working with them, their confidence levels also rose. Increasingly, in many jurisdictions day-to-day operations moved from direct and immediate medical control to pre-written protocols or 'standing orders', with the paramedic typically only calling in for direction after the options in the standing orders had been exhausted. Medical oversight became driven more by chart review or rounds, than by step by step control during each call. Scope of practice In the United States there are no federal guidelines for the scope of practice for any level of EMS provider. In the field, paramedics follow a set of pre-approved procedures and interventions for particular scenarios. For example, all fifty states allow for the administration of some form of anti-convulsive. In the state of Massachusetts a paramedic may administer the anti-convulsant, midazolam, up to a maximum of 6 mg . While in Maine paramedics are allowed to administer midazolam in upwards of 10 mg boluses. These pre-approved procedures are known as standing orders. Standing orders cannot surpass a provider's scope of practice. Scopes of practice represent the degree to which providers are trained. The following is derived NHTSA's "National EMS