Inspection and leak detection of electrically insulated containers having an electrically conductive solution therein in high speed assembly carrier line systems, includes controlled carrier structure and methods for carrying, conveying, orientating, and spinning the containers in a desired line of travel for high frequency high voltage spark testing workstation processing. A plurality of carriers convey the containers along a pathway to a particular orientation relative to a high voltage leak detection system to obtain an electric current volume reading. The carriers are orientated so as to dispose the conductive solution along a longitudinal axis of the containers in contact with a longitudinal portion of an internal circumference of the containers, to expose a portion of an external circumference of the containers to the inspection electrode of a high voltage leak detection system, and to expose a portion of an external surface of the containers to a detection electrode of a high voltage leak detection system. While so orientated, the containers are then spun by a rotating roller or belt in abutment with the containers to expose successive longitudinal portions of said internal circumference of the containers in contact with the conductive solution of the containers for electric current volume reading by the high voltage leak detection system.