EMS HELI CREW UNABLE TO BRING IN RELIEF CREW FLIES OVER DUTY TIME.

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FLYING AN EMS CONTRACT AT HOSPITAL WE WERE DISPATCHED TO ZZZ; AT XX00 HRS. (THE NIGHT PIC WAS AVAILABLE BUT THE NIGHT SIC WAS NOT). A DECISION TO GO WITH A NIGHT PIC AND DAY SIC WAS MADE DUE TO PATIENT CONDITION AND FLC WAS ASSURED OF NO MORE THAN 30 ON THE GND WHICH SHOULD HAVE GOTTEN US BACK BY YY00 END OF SIC CREW DUTY TIME. AFTER A LITTLE WHILE ON GND; DOCTOR ADVISED A DELAY TO OBTAIN PERMISSION FROM FAMILY FOR ECMO TREATMENT ON ARR AT HOSPITAL. AT ZZ15 PIC TRIED TO ARRANGE FOR FIXED WING CREW CHANGE FROM XYZ TO ZZZ FOR SIC CHANGE. GOVERNOR WAS ARRIVING AT ZZZ AND FLYING SVC WAS UNABLE TO DISPATCH AN SMT FOR 1 OR 2 HRS. THE PATIENT WAS IN CRITICAL CONDITION AND FLC MADE THE DECISION NOT TO DELAY TRANSPORT OF PATIENT TO HOSPITAL BECAUSE OF INFO FURNISHED BY DOCTOR. AT ZZ36 WE DEPART ZZZ HOSPITAL A AND ARRIVED AT ABC AT ZZ42 WHICH MADE ME EXCEED DUTY TIME OF 14 HRS BY 1 HR AND 45 MINS. TO PREVENT THIS IN THE FUTURE; WE CALLED THE SECRET SVC AND THE GOVERNOR'S PEOPLE TO RELEASE AN ACFT FOR ACH CREW CHANGE IF HE IS ELECTED PRESIDENT. THERE SHOULD BE ALLOWANCES FOR EMS OPS IN 135.267 TO MAKE EXCEPTION FOR CRITICAL CARE PATIENTS AND TRANSPORT RESTRICTIONS FOR CREWS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT USUAL PROC WHEN A PLT IS REACHING 14 HR DUTY TIME IS TO FLY RELIEF PLTS TO THE LOCATION. IN THIS CASE; HOWEVER; SECRET SVC WOULD NOT ALLOW COMPANY TO ENTER RAMP AREAS FOR ANY REASON. THIS SITUATION WAS RESOLVED BY PRESIDENT AT LATER TIME WHEN HE BECAME AWARE OF ISSUE. EMS TYPE OPS WILL BE ALLOWED TO PROCEED UNOBSTRUCTED.