[TFreemen]

Code:

enum pInfo
{       
     pAdmin,
     pAdminDuty,
};
new PlayerInfo[MAX_PLAYERS+1][pInfo];

CMD:aduty(playerid, params[])
{
	if(PlayerInfo[playerid][pAdmin] < 2) return SendClientMessage(playerid, -1, "This is an admin only command!");
	if(PlayerInfo[playerid][pAdminDuty] == 0)
	{

		SendClientMessage(playerid, COLOR_YELLOW, "You are now on administrative duty! ");
		PlayerInfo[playerid][pAdminDuty] = 1;
		SetPlayerHealth(playerid, 100000);
		SetPlayerArmour(playerid, 100000);
		new string[128];
		format(string, sizeof(string), "Administrator %s is now on Admin Duty! (/report for assistance)", GetPlayerNameEx(playerid));
		SendClientMessageToAllEx(COLOR_YELLOW, string);
	}
	else
	{
			SendClientMessageEx(playerid, COLOR_RED, "You are now off admin duty!");
			SetPlayerHealth(playerid, 100);
			SetPlayerArmour(playerid, 0);
			PlayerInfo[playerid][pAdminDuty] = 0;
	}
    return 1;
}

BTW don`t forget to define the colors