The Raiders are tied for last in the league in terms of turnovers on defense. Perhaps most glaring, the Raiders are one of only two teams without an interception this season. Hence, there is what strong safety Tyvon Branch calls an added emphasis on getting that turned around. In a hurry. The Raiders forced four fumbles, and recovered three, their first four games. Even so, that’s not the rate of return coach Dennis Allen and defensive coordinator Jason Tarver want on their investment.