During fingerprint rolling, which direction is typically preferred for thumbs?

During fingerprint rolling, the preferred direction for thumbs is typically toward the body. This method ensures that the unique patterns of the thumbprint are captured efficiently and consistently, providing a clear impression for identification purposes. When rolling the thumb toward the body, it allows the analyst to better control the movement and maintain the necessary pressure required to transfer the ridges and valleys of the thumb's skin onto the fingerprint card or device, leading to higher quality prints. This technique also helps avoid smudging and ensures that the entire surface area of the thumbprint is captured.

The other options, while they describe various movements, do not align with established fingerprinting techniques that are commonly employed for clarity and accuracy.