in order to check hand luggage and other objects carried by persons , control stations are needed , which have a control unit , in particular an x - ray checking unit , a conveyor which extends through the control unit , a depositing point which is arranged ahead of the conveyor , and a removal point which is arranged behind the conveyor , for the objects and having transport tubs which can be placed onto the conveyor . small objects and items of clothing are placed in the transport tubs and conveyed through the control unit for checking . a return conveyor for the transport tubs is arranged next to or below the conveyor which passes through the control unit , which return conveyor reaches from the removal point behind the conveyor at least as far as into the region of the depositing point ahead of the conveyor .