This description of the Walk and Turn test posted by San Francisco DUI Lawyer.

The officer can score a point if the suspect steps off the line. This means that one of the feet must be entirely off the line and not merely diagonal or not straight along the line. Even if the suspect steps off one or two times, they are only given one point.

As previously mentioned, during the instruction stage if the suspect sways or uses their arms for balance a point can not be scored. A point can only be scored during the walking stage when the suspect raises one or both arms more than six inches from the side in order to maintain balance. This should take into consideration that this distance may be the normal position of the arms, as in some bodybuilders. Any benefit of the doubt must be given to the suspect. The mere raising of the arms is not a point. The arms do not have to remain exactly at the side. If they are raised less than six inches, no points can be assessed.