A taxi cab driver witnessed a male and a female involved in a verbal argument which escalated into a physical altercation. The male suspect appeared to be the aggressor. The first officer on scene detained the suspect (Johnson, Tiontee 6/21/79, Concord) without incident. The subsequent investigation revealed that the male and female were involved in a dating relationship. During the argument, the male grabbed the victim around her neck according to the witness. The victim had redness to her neck area, but declined any medical attention. The suspect was arrested and booked into the Martinez Jail for domestic violence. The suspect was also issued a prohibition order.