[leonardo1434]

Here you go..

pawn Код:

new isplayeronduty[MAX_PLAYERS];

CMD:duty(playerid,params[])
{
   new name[MAX_PLAYER_NAME],lol[128];
   if(stats[playerid][admin]/*<<<put here your admin "system"*/ < 1 && !IsPlayerAdmin( playerid ) ) return SendClientMessage(playerid,-1,"not authorired");
   if(sscanf(params,"")) return SendClientMessage(playerid,-1,"/duty");
   if(isplayeronduty[playerid] == 1)
   {
    isplayeronduty[playerid] = 0;
    GetPlayerName(playerid,name,sizeof(name));
    format(lol,sizeof(lol),"%s is Off duty!",name);
    SendClientMessageToAll(-1,lol);
   }
   else{
   GetPlayerName(playerid,name,sizeof(name));
   format(lol,sizeof(lol),"%s is ON duty!",name);
   SendClientMessageToAll(-1,lol);
   isplayeronduty[playerid] = 1;
   return SetPlayerHealth(playerid,999999);
   }
   return 1;

}