Doritos Cool Ranch Tacos are being sold at Taco Bell stores throughout the area in Walnut Creek Calif., on Wednesday, March 6, 2013.  (Dan
Doritos Cool Ranch Tacos are being sold at Taco Bell stores throughout the area in Walnut Creek Calif., on Wednesday, March 6, 2013. (Dan Rosenstrauch/Staff) ( DAN ROSENSTRAUCH )