There has been recent legislation to outlaw forms of synthetic marijuana. This does not mean, however, that the substance you had is an illegal substance. The state attorney will need to have it tested to see if the substance you are accused of possessing is indeed illegal. I would recommend contacting a criminal defense attorney as soon as possible, and stop talking about your case online.
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The State of Florida is making a point to stop the distribution, possession and use of synthetic drugs. Just on December 11, 2012, the Attorney General of Florida issued Emergency Rules outlawing 22 new forms of synthetic drugs. I would also advise you to contact a local criminal defense attorney with experience handling synthentic drug cases.
Here's my write-up of the new emergency rules: http://lawfl.net/news/florida-attorney-general-pam-bondi-issues-emergency-rule-outlawing-22-additional-synthetic-drugs/