Even if we shuffle the deck and turn the cards in random way? Will be cheating impossible in this case?
If it is the mechanic who does the shuffling, how will you know that the cards are really turned random?
It is a big mistake to think the the dealer will never be involved in cheating. On the contrary, the dealer collaborating with a player is probably the most common cheating. The dealer helps the player win and gets his share of the money.