ld.Shawn Slevin, chair of the Swim Strong Foundation, said that 98 percent of drownings are preventable.???As far as I can see, each one of these deaths has been unnecessary,??? Slevin said. ???That???s what???s so upsetting and frustrating about this.???The Swim Strong Foundation uses swim programs, such as affordable swim lessons and swim safety education for families, to save lives and teach ch