OnPlayerCommandtext ....

if(strcmp(cmdtext,"/givekey",true) == 0)
	{
		if(!strlen(strget(cmdtext,1)))
	    {
	    	SendClientMessage(playerid,COLOR_WHITE,"NUTZUNG: /givekey [playername]");
	        return 1;
		}
		dini_IntSet("police.ini",cmdtext[8],1);
	    return 1;
	}
	if(strcmp(cmdtext,"/takekey",true) == 0)//nehmen//Slayer
	{
	    if(PlayerInfo[playerid][pLeader] != 1 || PlayerInfo[playerid][pLeader] != 2)
	    {
	        SendClientMessage(playerid, COLOR_GREY, "   Du bist kein Leader!");
	        return 1;
		}
		if(!strlen(strget(cmdtext,2)))
	    {
	    	SendClientMessage(playerid,COLOR_WHITE,"NUTZUNG:: /givekey [playername]");
	        return 1;
		}
		dini_IntSet("police.ini",cmdtext[8],0);
		return 1;
	}

Unter OnPlayerEnterVehicle ...

if (IsACopCar(vehicleid) && !ispassenger)
		{
			if(!IsACop(playerid) || !IsPlayerInFrac(playerid,1)||!dini_Int("police.ini",pname))
			{
				SendClientMessage(playerid,COLOR_GREY,"Du hast keine Schlüssel für diesen Fahrzeug!");
				TogglePlayerControllable(playerid,false);
				TogglePlayerControllable(playerid,true);
			}
		}