A mobile security checkpoint comprising: a transport device; and at least one checkpoint module contained on said transport device, the module comprising: an item screening area including an input area that receives an item deposited by a person, an item screening device that screens the item, and an output area that returns the item to the person after completion at least of the first of a first and a second personal screenings, a personal screening area positioned adjacent to the item screening area, the person entering the personal screening area after depositing the item in the input area, the personal screening area including a personal screening device performing a first personal screening to determine whether to perform a second personal screening, the person leaving the personal screening area and retrieving the item from the output area in a substantially straight path if the second personal screening is not performed, an enclosure, the enclosure being physically separated from the item screening area and the personal screening area, wherein the person leaves the personal screening area and enters the enclosure if the first personal screening indicates a need to perform a second personal screening, the second personal screening occurring in the enclosure, wherein the enclosure includes an entrance and an exit, the entrance being positioned proximately to the personal screening area, the exit being positioned proximately to the output area in the item screening area, such that people are screened in the enclosure apart from their items, characterized in that the enclosure has substantially clear walls to allow people in the enclosure to observe the item screening area and track their items. a transport device; and at least one checkpoint module contained on said transport device, the module comprising: an item screening area including an input area that receives an item deposited by a person, an item screening device that screens the item, and an output area that returns the item to the person after completion at least of the first of a first and a second personal screenings, a personal screening area positioned adjacent to the item screening area, the person entering the personal screening area after depositing the item in the input area, the personal screening area including a personal screening device performing a first personal screening to determine whether to perform a second personal screening, the person leaving the personal screening area and retrieving the item from the output area in a substantially straight path if the second personal screening is not performed, an enclosure, the enclosure being physically separated from the item screening area and the personal screening area, wherein the person leaves the personal screening area and enters the enclosure if the first personal screening indicates a need to perform a second personal screening, the second personal screening occurring in the enclosure, wherein the enclosure includes an entrance and an exit, the entrance being positioned proximately to the personal screening area, the exit being positioned proximately to the output area in the item screening area, such that people are screened in the enclosure apart from their items, characterized in that the enclosure has substantially clear walls to allow people in the enclosure to observe the item screening area and track their items. an item screening area including an input area that receives an item deposited by a person, an item screening device that screens the item, and an output area that returns the item to the person after completion at least of the first of a first and a second personal screenings, a personal screening area positioned adjacent to the item screening area, the person entering the personal screening area after depositing the item in the input area, the personal screening area including a personal screening device performing a first personal screening to determine whether to perform a second personal screening, the person leaving the personal screening area and retrieving the item from the output area in a substantially straight path if the second personal screening is not performed, an enclosure, the enclosure being physically separated from the item screening area and the personal screening area, wherein the person leaves the personal screening area and enters the enclosure if the first personal screening indicates a need to perform a second personal screening, the second personal screening occurring in the enclosure, wherein the enclosure includes an entrance and an exit, the entrance being positioned proximately to the personal screening area, the exit being positioned proximately to the output area in the item screening area, such that people are screened in the enclosure apart from their items, characterized in that the enclosure has substantially clear walls to allow people in the enclosure to observe the item screening area and track their items.