I took a suboxone on a Saturday, and the following Tuesday I took a mouth swab drug test for probation to get sent out and he marked on the test to test for suboxone.. now that I only took it once and not often, do you think it will be detcted in the mouch swab test?

Yes, I do. Suboxone has a half life of 36 hours. Mouth swap tests are pretty accurate. Its likely that it would show up for weeks.

Plus, its not THAT common of a drug, so if they are testing for it, it sounds like they have a good reason.

Get a lawyer now... because I would bet money that you are about to be slammed with a Violation of Probation.