on a computer system a program computer program or software application may include a subroutine a function a procedure an object method an object implementation an executable application an applet a servlet a source code an object code a shared library dynamic load library and or other sequence of instructions designed for execution on a computer system a data storage means as defined herein includes many different types of computer readable media that allow a computer to read data therefrom and that maintain the data stored for the computer to be able to read the data again such data storage means can include for example non volatile memory such as rom flash memory battery backed up ram disk drive memory cd rom dvd and other permanent storage media however even volatile storage such as ram buffers cache memory and network circuits are contemplated to serve as such data storage means according to different embodiments of the present invention various embodiments of the present invention overcome problems with the prior art by providing a distributed array of sensors including one or more horizontal arrays allowing a brief stop of a vehicle or container for analysis the various embodiments provide for 1 an ability to scan the contents of a vehicle container as it enters and exits a detection zone 2 a.