Patent ID: 7789401

Claim:
A method comprising: using a plurality of carts in an x-ray security screening system, wherein said x-ray security screening system comprises: an x-ray security scanning device having a proximal end and a distal end; and a first tray and a second tray each tray comprising a base having upwardly extending walls, and wherein said trays comprise information visible to a user of said trays; wherein said trays are stackable wherein said second tray fits into said first tray, said trays initially contained in a first cart positioned at said proximal end of said x-ray security scanning device; wherein said trays are passed through said x-ray security scanning device from said proximal end to said distal end; wherein said trays are finally contained in a second cart positioned at said distal end of said x-ray security scanning device; wherein said second cart is moved to said proximal end of said x-ray security scanning device; wherein said trays and said first cart and said second cart comprises non-metallic materials; and wherein at least one of said first cart and said second cart comprises information visible to a user of said cart.