Last June, Ashley LaRue and Brandon Shenkman got the phone call every parent dreads. While attending a Westchester County summer camp, their 5-year-old son lost consciousness in a swimming pool. “They found him floating in the pool and my whole body went numb,” Shenkman said. A police report from the incident says the boy was saved only when a private swim instructor, not employed by the summer camp, rushed over to administer CPR. A county hea…