The Supreme Court on Monday sided with law enforcement in a pair of cases that implicated “qualified immunity,” the controversial legal doctrine that gives police broad protection from lawsuits. In a pair of unsigned summary rulings issued without noted dissent, the justices reversed two federal appeals courts that had permitted excessive force lawsuits to proceed against officers in separate cases arising from California and Oklahoma. The justices ruled the officers should be granted qualified immunity, which shields government officials from liability unless it is proven they violated a “clearly established” right, a difficult legal hurdle. Both lawsuits dealt with police...