Failure to Surface?

I was measuring a pool for placement of the markers for the referees to monitor surfacing off the starts and turns at a meet this weekend, and after doing so, wondered how many of you have ever been DQ'd or even "Warned" for exceeding the 15m distance in the various strokes... I didn't include freestyle, well, because I just thought that was silly! :D But, HEY! someone fixed the poll later... (I didn't think they could DO that!)