Making sure your babysitter is trustworthy

Three-year-old Hannah Wesche's parents were stunned to learn their daughter had suddenly "gone limp" and stopped breathing while under the care of a babysitter. They were even more stunned to learn her condition might have been the babysitter's fault — Lindsay Partin admitted to "striking" and shaking the toddler. Hannah might not live. How can you make sure the people you hire to care for your children deserve your trust — and how can you know the difference between a normal bump and a mark of abuse?