Concerns over food safety have been raised by the discovery of mad cow disease in Tulare County, California. USDA officials assure consumers the food chain is safe while they continue to investigate whether any other animals are infected. The California Department of Corrections rolled out a plan this week that would cut prison spending by billions of dollars, end federal court oversight and improve operation of the nation's largest state prison system. The changes are largely due to realignment, a program which redirects low-level offenders to local jails. This weekend's closure and demolition of the seismically unsafe Doyle Drive approach to the Golden Gate Bridge is expected to snarl traffic in and around San Francisco. Starting Monday, drivers will use a temporary bypass, traveling through a newly constructed tunnel as workers begin the next phase of the $1.1 billion Presidio Parkway.