A pharmaceutical order filling system uses a physical parameter that occurs during attaching cap to a pharmaceutical container to determine if the cap is properly engaged. The physical parameter may be torque on the cap when placed on the container. An order processing device receives a pharmaceutical order and sends the order to a dispensing device that fills the container with a pharmaceutical in the pharmaceutical order. A cap device is configured to apply the cap the container containing the pharmaceutical from the dispensing device, wherein the cap device is configured to sense the physical parameter, e.g., torque, to the cap when applying the cap to the container.