An implantable stimulator that includes a housing, a first plastic component, and a second plastic component, where the first and second plastic components form a polymer-polymer interface. Under control of a backup system, opaque object attributes and a data identifier are received, wherein the data identifier is generated based on one or more relevant object attributes of the opaque object attributes that indicate whether at least one of the content of the object and one or more of the relevant object attributes has changed. The light is connected to the vehicle’s on-board electrical power system and is activated automatically without distracting driver attentiveness, but with provisions for manual over-ride activation if needed in special circumstances such as emergencies or wheelchair loadingunloading. Since treatment gas flows along the front surface of the gas flow regulating portion 37a, treatment gas equally contacts the wafer W in the radius direction of the wafer W. The systems and methods highlight anomalies that have changed between the collection times of two or more diagnostic images, and can also provide objective scoring of the degree of change.