They're mostly just looking for polyps, anybody can do that, it's just a zit... Any discoloration or tissue difference would have to be spotted by a licensed physician, but polyps are easy to see for the most part... If you had some really flexible hollow 1/2'' diameter flex hose, about 2 or 3 feet long. Take a webcam housing off from around the lens and circuit board, run the cable attached to webcam lens and circuit board through the hose, insert circuit board into flex hose and mount camera lens even with the end of the hose, grind a flashlight lens down to the inside diameter of the hose, cover camera lens with adjusted flash light lens, plug into your computer and turn the web cam on, ram the device up your *** and look for the polyps. I wouldn't suggest trying to make the turn into the transverse colon though because you could cause some major problems for yourself. Suggest using an enema first so your camera doesn’t get full of ****. And a little lube, you could even broadcast it live to all your friends.