Sending SAT scores

<p>I've only taken the SAT Is once and am contemplating taking it again but with regards to sending scores:</p>

<p>If I choose NOT to use score choice and I only send scores from ONE of the SAT sittings that I took, will schools know that I took the test more than once and am only sending them the one score?</p>

<p>If so, would this have a detrimental affect on my application?</p>