Using the dealer's signature\n\n One way of predicting where the ball might land in a game of roulette is to look for the dealer's signature, also known as sector slicing. This theory suggests that the dealer may hit the same numbers more often due to the way in which they spin the wheel.
However, it's important to note that the house always has an edge in roulette, as with most casino games, to ensure that over time, the casino will make a profit. Outside of a poorly trained or bored dealer spinning the wheel and ball exactly the same, with exactly the same release, Roulette is random.