GM has a camera under the hood that can see you messin with stuff. Why dont you think they did away with the UH light on 03s? They had to pay for that camera, It beams a signal via Onstar back to GM headquarters and then the dealer is notified that you visit via GPS, any dealer you are with in 20 miles of gets an alert, so if your traveling, your alerting alot of people! It also appears that GM is using a invisable dye on the connectors that is only visable with a special light, its on the latches for the connectors and your finger prints will show up bright yellow under the light. Last I heard they were working on a tamper proof lock similer to what the power co uses on your meter, it will go on a DLC plug and also will go on the latches for the engine harness connectors. Expect to see them out soon and we are being told at the dealer level to install these at the trucks first visit after the release. And dont think you can just go and buy these, there will be a form that must be filled out which must include the infomation on who, why and when the lock had to be removed. They are charged to the Vin, for instance, if you have had three repairs that needed them to be used, but your vin is charged with 4....uh oh. GM is getting very serious on this stuff and Its a matter of time before the Sh&T hits the fan with them. I dont wanna be the first guy that gets caught with a broken or removed tamper device.....