[]Rafaellos[]

Maybe something like this:

pawn Код:

public OnPlayerText(playerid, text[])
{
    if(pInfo[playerid][OnDuty] == 1) //change it to yours
    {
        new string[128];
        GetPlayerName(playerid,string,sizeof(string));
        format(string,sizeof(string),"((%s says: %s))",string,text[1]);
        SendClientMessageToAll(-1,string);
        return 0;
    }
    return 1;
}

And use:

pawn Код:

pInfo[playerid][OnDuty] = 1; //or what ever your using

on your OnDuty command.

Not tested but i think will work!