A week after Laci Peterson disappeared, Modesto police said Tuesday that foul play had become the main focus of the investigation. Detective Jon Buehler said other possibilities had not been ruled out. But, he said, "as we continue to profile Laci's background, gather witness statements, recognize her close relationship with family and friends, investigate the circumstances of her disappearance, and in view of the timing with the holiday season, it is becoming more apparent that her disappearance is the result of foul play." Police spokesman Doug Ridenour said: "We are hopeful that we will find her alive. But seven days...