While I write this question, I am certain I completely miss the spirit of the world championship. But however, I got curious about how well the cheating-countermeasures at the championship actually work.
Before the match, I watched a TV program which explained how the games would be, and they showed us a metal detector that the players had to go through before every match. The purpose of the metal detector was to find devices that could be used for cheating.
In today's match (number 7), I notice that Anand is wearing his wrist watch. I would believe this would trigger the metal detector, and I doubt they would dismantle it to check if it's ok.
Since the metal detector is a countermeasure to cheating, should they let devices such as wristwatches pass?
I seriously doubt that anyone would cheat at this level - I cannot imagine the impact it would have on the game (their career).