It is a general problem of online chess playing communities, that some pleople use their chess programs as seconds.
I know some chess communities, and always after some time it was clear, when somebody used a program. So the community admin was contacted and he deleted the computer player.
In my opinion it is OK to take some looks in books, e.g. for opening variations or for endgames. Sometimes I also check online opening repositories, such as chess base.
But if someone ONLY use a program to play, it is fatal, should not be allowed. Now, we cannot control this, but as I wrote: After some time it will get clear, if somebody only use a program.
We should be honest, and I always tell my opponent, if the time for the next move will be longer, because I want to anlyze the game deeper. In one case I also used Fritz to check an endgame but I previous declared, that I want to draw the game.