Did she actually use the word "cleared"?? When I called she said the results had been sent back to USCIS the same day - and when I asked if the fingerprints were cleared - she said no she cannot give me that information - but only that their results (good or bad) had been sent back the same day.
Very helpful indeed
I made a point of specifically asking if my prints were cleared, and was told that only the results have been sent back. The USCIS decides whether or not to clear them.
I've never been arrested, and the only time I've been fingerprinted was during the green card process. I think it's safe to assume that your fingerprints will be cleared if your situation is similar.