A method is provided for identifying mail pieces which may contain a suspicious. The method and apparatus makes use of the projection of a defined intensity pattern onto the moving object and the recording and analysis of a reflected pattern from the object wherein the intensity pattern projection is synchronized to a characteristic periodic frequency period or sub-period of the moving object. Additionally, the IC chip on base material is mounted on the base material joined to said panel substrate. The method includes, upon completion of the pre-flight test, outputting a result of the pre-flight test from the engine control circuitry. The screen-washing arrangement using the liquid matter from the liquid matter compartment as a washing fluid. A payment validation is received from the validation system.