In a solid electrolytic capacitor of the present invention, a virtually plate-like anode having a porous sintered body, a dielectric layer, and an electrolyte layer are sequentially formed on an anode lead so as to cover a portion of the anode lead. These compounds and compositions are useful for reducing or preventing abuse and overdose of amphetamine. The optical sensor unit includes a sensor unit housing adapted to be mounted on the transparent meter housing part of the utility meter housing using an adhesive. The first folding optics provides a second portion of the modulated illumination beam that is adjacent the first portion of the modulated illumination beam in the length-wise direction at a second imaging area that is not adjacent the first imaging area in the length-wise direction.