Teachers' unions find themselves on the defensive in states across the country, as governors and lawmakers press forward with proposals to target job protections and benefits that elected officials contend the public can no longer afford academically or financially. Many of those efforts are being driven by newly elected Republicans, who have…

It sounds like a simple solution to a growing problem: Address teacher shortages by adopting policies that encourage veterans to stay in the classroom while attracting retirees back to the job. While many states and districts are doing just that, they are also finding that their policies can have unintended consequences--such as raising questions…