You folks know who you are... Drafting isn't allowed in an ITT. In case you really didn't know, here's the OBRA rule:

17.5.5 No rider may ride closer than 25 meters behind and 2 meters to the side of another rider. A rider attempting to pass another rider must complete the pass within 500 meters, otherwise he must drop back at least 25 meters behind the other rider.

Playing fair is much more fun.

Peter Drake
FMCT