WASHINGTON – Peanuts, Cracker Jacks and now metal detectors.

A sport that has long valued a “good eye” is turning to technology to provide a closer look and improve ballpark security.

By Opening Day next month, 29 major league ballparks, including Nationals Park, will have metal detection screening for all fans prior to entry.

“We obviously encourage everybody to come early to the games,” says Frank Gambino, vice president of ballpark operations for the Nationals.

The new screening will be in effect for the exhibition against the Yankees on April 4.

“We’ve essentially modified the vast majority of gates at Nationals Park, expanded them, added walk-through metal detectors,” he says.

Only Wrigley Field in Chicago will delay the league mandate, due to ongoing renovations.

At Nationals Park, season ticket holders will have dedicated security lanes at four different gates.