The present invention relates to an anti-tamper cam system 2 used to selectively operate a safety interlock switch 6. In one embodiment, the software searches a web page for delimiters such as quotes that are in proximity to a link to another web page. The cooling fluid cavity is defined in the outer wall, extends generally radially between the inner and outer ends of the outer wall, and receives cooling fluid for cooling the outer wall. Located within the expandable member are materials of different densities wherein the materials of different densities cooperate to indicate the orientation of the device within a lumen. The serial bus controller is operable to direct a message for a service unit on the serial bus to only the serial channel of the service unit. Preferably, the ratio of the CBD type compounds or derivative thereof and THC type compounds or derivative thereof is between 18:1 and 30:1.