Been away a lomg time.....

I just returned after being away from the site for years and thought I would try out a few correspondence games.  Now I know that I am very rusty, however, when I look at the people I am playing and their ratings in all aspects of chess, I cannot help but decide that they are using chess engines.  They never miss a move and yet have low ratings in other areas:i.e. blitz chess.  This ruins the game for me as I do not wish to play against a computer.  Maybe I am just that rusty, but with the lower ratings I am playing and they never miss a trap? or line?  What does this site do to make sure people do not cheat and use engines?

I think it is impossible.  When it comes to super GM's many would be kicked off this site because most of their moves would be much in line with the top chess engines.