How about some page refs and quotes on that, then?
Well...I'll be doggone if I didn't find a page number for you...
Check out the 3.5 DMG, pg. 18, under the title DM CHEATING AND PLAYER PERCEPTIONS.
Second paragraph, first sentence: Do you cheat? The answer: The DM really can't cheat.
Then, it goes into, blah, blah, blah, all the other things I've been saying on this thread.
I'm sure the "DM Can Cheat!" crowd will have something to say about that, even though, there it is, right there in black & white.
The GM can't cheat.