A growing number of schools and community colleges in California are refinancing voter-approved bonds to raise extra cash, a practice many financial experts say puts an additional burden on taxpayers and may violate state law. The process, known as cash-out refunding, is similar to refinancing a home mortgage to lower monthly payments and take out equity in cash. It's popular because the school districts get extra money - frequently millions of dollars - without going back to the voters. Most use the money to cover construction cost overruns, but critics say California law limits the use of refunded bonds for...