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Exhibit
23.3
CONSENT
OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We
hereby
consent to the incorporation by reference in
this
Registration Statement on Form S-8 of Implant Sciences Corporation, filed on
October 27, 2006, of our report dated December 23, 2004, relating to the
financial statements of Core
Systems, Inc.
which
appears in Implant Sciences Corporation’s Form 8-K/A filed on December 29, 2004.
We also consent to the reference to us under the heading “Experts” in such
Registration Statement.
/s/
Nation Smith Hermes Diamond, APC
San
Diego, California
October
27, 2006