Minnesota’s duck-hunting season opens Saturday and with area rivers swollen from recent rains, officials are stressing water safety. Tim Smalley of the DNR says the lack of life jackets is still one of the most common law violations among waterfowl hunters. And he says it’s the most common cause of duck hunter deaths – more frequent than gun accidents. 13 duck hunters have drowned in boating accidents since Minnesota made life jackets mandatory in 1988. But that compares with three to six per season before.