Police have long noticed that the building of a new Wal-Mart increased illegal drug activity in the general area. This was long assumed to be due to the influx of people and money around the store. But a new study indicates that the advanced inventory control skills that Wal-Mart teaches its employees is the primary reason for the increased activity. Local drug dealers who have jobs with Wal-Mart gain vital logistical and organizational skills that they copy and apply directly to their own illegal activities.