GOV HELI FLIES INTO TEMPORARY RESTR PROHIBITED AIRSPACE.

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I AM GOV AGENT/PLT. WHILE FLYING A GOV OWNED UH-1 HELI; INADVERTENTLY FLEW INTO A RESTR/PROHIBITED AREA. THE EVENT OCCURRED WHILE CONDUCTING A FAMILIARIZATION FLT FOR GOV ACTION. TEAMS TO CONSIDER POSSIBLE LNDG SITES FOR DEPLOYMENT OF THE ACTION TEAMS IN THE EVENT OF AN EMER DURING VIP VISIT TO THE MIAMI; FL; AREA. THE FLC WAS BRIEFED BY THE APPROPRIATE AUTHS THAT NO LOCATION WOULD BE RESTR/PROHIBITED UNTIL XY40 AM. AT XX00 AM WE DEPARTED OPF ARPT FOR THE SCHEDULED 50 MIN FLT. WE CLBED TO 500 FT AGL AND FLEW E TO THE SHORELINE. CONTACT WAS ESTABLISHED WITH THE MIAMI ARPT CTL TWR AND THEREAFTER IDENTED OUR ACFT AS A LAW ENFORCEMENT ACFT BY STATING OUR CALL SIGN AS 'ABC.' WE IDENTED OUR CURRENT POS AND ADVISED ATC THAT WE WERE GOING TO CONDUCT A FAMILIARIZATION FLT S ON THE SHORELINE OF FLORIDA. AFTER ESTABLISHING RADIO CONTACT WE FLEW E TO HAULOVER PARK WHICH WE CIRCLED BECAUSE IT WAS A POSSIBLE LNDG ZONE SITE FOR DIGNITARIES ASSOCIATED WITH THE VIP'S VISIT. WE THEREAFTER PROCEEDED S TO THE NEXT SITE; WHICH WAS THE XXX HOTEL. AT SOME POINT NEAR THIS LOCATION THE MIAMI CTL TWR ASSIGNED A XPONDER CODE TO OUR FLT. WE SUBSEQUENTLY CIRCLED THE HOTEL TO THE R AT 500 FT; MAKING ONLY 1 COMPLETE CIRCLE. OUR INITIAL COURSE TOOK US BY THE HOTEL ON THE E SIDE; OVER THE BEACH. WE MADE A TURN TO THE R FOR 1 COMPLETE CIRCLE OF APPROX 2 MINS DURATION AT THE S SIDE OF THE HOTEL. AFTER COMPLETION OF THE CIRCLE; WE MADE A L TURN AND PROCEEDED S FOR THE REST OF THE FLT. AFTER RETURNING AND LNDG AT OPF ARPT (XX50 AM) WE WERE INFORMED THAT THE BRIEFING WE RECEIVED PRIOR TO THE FLT HAD BEEN IN ERROR AND THAT THE HOTEL WAS PROHIBITED AIRSPACE DURING THE TIME OF OUR FLT. ALL NOTAMS HAD BEEN CHKED BY OUR BRIEFING PERSONNEL BUT HAD BEEN MISSTATED DURING THE BRIEFING BY BEING 1 DAY OFF IN REGARD TO THE HOTEL. THE ONLY INFO RECEIVED FROM FAA ATC ENTITIES DURING THE ENTIRE FLT; DEP TO RETURN; WAS TA'S AND OTHER NORMAL FLT INFO. ALSO; WE WERE NEVER ADVISED BY THE ATC THAT WE WERE IN OR NEAR A PROHIBITED OR OTHERWISE RESTR AREA. THIS MATTER IS PRESENTLY UNDER AN ADMINISTRATIVE INQUIRY WITHIN THE GOV AGENCY IN ORDER TO ASCERTAIN THE CAUSE OF THE BRIEFING ERROR AND TO PREVENT ANY RECURRENCES IN THE FUTURE.