NEW YORK -- Officiating the famed tush push play remains a challenge for the league office.

Vice president of football operations Troy Vincent said Tuesday that the play is not a frequent topic of discussion at league headquarters but acknowledged it's "very difficult to officiate in real time" despite intensified efforts to spot potential false starts in recent weeks.

Meanwhile, the Philadelphia Eagles continue running their signature play to near-perfection.

"When the guard is in the neutral zone or someone else is in the neutral zone, it's really hard for that line judge to identify based on what he's looking at down the line of scrimmage," said Vincent from the NFL's fall meeting at the InterContinental New York. "At the end of the day, there's a team that still does it well. And

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