CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our report  dated April 9, 2004,  accompanying  the  consolidated
balance sheets of Invisa,  Inc. as of December 31, 2002 and 2003 and the related
consolidated statements of operations,  stockholders' equity, and cash flows for
each of the  years  then  ended  contained  in the  Registration  Statement  and
Prospectus,  which report contains an explanatory  paragraph relating to certain
significant  risks and  uncertainties  which conditions raise  substantial doubt
about the Company's  ability to continue as a going  concern.  We consent to the
use of the aforementioned  report in the Registration  Statement and Prospectus,
and to the use of our name as it appears under the caption "Experts".

/s/ Grant Thornton LLP

Tampa, Florida
September 10, 2004