The number of factories in the United States employing more than 1,000 workers was 1,014 in 2007. Typical large factories have many entrances and exits and are frequently organized as campuses with separate buildings. At the start and end of a workday, large numbers of workers come and go creating a traffic throughput problem for security screening. Barbecan portals are the solution. Shootings perpetrated by disgruntled employees are always a concern when so many employees are involved, especially given the decline in US manufacturing since 2000 and the accompanying layoffs.

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