The nation’s drug-addiction epidemic is driving a dramatic increase in the number of children entering foster care, forcing many states to take urgent steps to care for neglected children. Several states, such as New Hampshire and Vermont, have either changed laws to make it possible to pull children out of homes where parents are addicted, or have made room in the budget to hire more social workers to deal with the emerging crisis. Other states, such as Alaska, Kansas and Ohio, have issued emergency pleas for more people to become foster parents and take neglected children, many of them infants, into their homes.