Pass Interference Explained

By 4Football Staff · September 26, 2026 · 12 min read

What pass interference is, when the rule starts and stops, how defensive and offensive versions differ, and why the penalty is so large in the NFL and so smaller elsewhere.

A quarterback launches a ball forty yards downfield. A receiver and a cornerback arrive at the same moment, arms tangled, and the ball sails past both of them. A yellow flag lands on the grass a second later. Half the stadium cheers and half howls, and the broadcast spends the next two minutes arguing about whether there was too much contact, too little, or the wrong kind.

Pass interference is probably the most debated call in football because it combines three things at once: a judgment about contact, a judgment about the ball, and a penalty that can move the offense most of the length of the field. This guide explains what the rule actually says, what the officials are trained to look for, how the NFL, college and high school versions differ, and why the same contact can produce a different flag depending on exactly when it happens.

The idea behind the rule

A forward pass is a contest. The offense wants its receiver to be able to catch the ball, and the defense wants its defender to be able to break it up or intercept it. The rules let both sides compete, but they draw a line: once the ball is in the air, neither player may prevent the other from having a fair chance to play it by means other than playing the ball itself.

That is the heart of pass interference. It is not "any contact downfield." Receivers and defenders bump, lean, jostle and run into each other on nearly every pass play, and most of it is legal. The foul is contact that significantly hinders the opponent's ability to catch or defend the pass, committed when the ball is in the air and the player is not making a legitimate play on the ball.

Two details follow from that idea and explain most of the controversy:

• The rule is about opportunity, not outcome. A defender can interfere with a receiver on a pass that the receiver would not have caught anyway, and the flag is still correct if the pass was catchable. Equally, a ball that is clearly uncatchable usually cannot produce an interference foul at all.
• The rule is about timing. Pass interference exists only while the ball is in the air. Before the throw and after the ball is touched, the same contact is judged under other rules.

When the rule begins and ends

At every level, the pass interference restrictions begin when a forward pass is thrown and end when the ball is first touched by any player. That window is the whole story.

Before the throw, contact between receivers and defenders is governed by other rules, mainly the limits on how much a defender can hold, grab or hit a receiver away from the ball. Those are covered in our guides to illegal contact and defensive holding and to holding. After the ball is touched, say by a tipped pass, a defender or receiver may play through the loose ball like anyone else, and interference can no longer be called.

Two practical consequences are worth knowing:

1. The pass must be a forward pass that crosses the line of scrimmage. A screen pass thrown behind the line, or a backward pass, does not create the same protection. Contact on a receiver running a route on a play where the quarterback has not yet thrown is not pass interference; it is a candidate for illegal contact or holding.
2. A pass that is caught or intercepted ends the question. Once a defender has the ball, interference is no longer on the table.

Defensive pass interference

Defensive pass interference, often shortened to DPI, is the version most people picture. In general terms, it is a foul when a defender, with the ball in the air, does one of these things to an eligible receiver who has a chance to catch the pass:

• Grabs, pulls, pushes or tackles the receiver in a way that restricts his movement toward the ball.
• Makes contact with the receiver before the ball arrives when the defender is not playing the ball, such as running through a receiver's back or arms from behind without looking for the ball.
• Cuts in front of a receiver without playing the ball, so that the receiver runs into him.
• Grabs an arm or jersey so that the receiver cannot extend for the ball.

Officials describe this as hindering the receiver's ability to catch. The defender is allowed to turn and play the ball, to reach for it, to intercept it, and to make incidental contact in doing so. Two players who both turn and honestly go for the ball and collide are not committing a foul, even if one gets knocked down. That is a mutual right to the ball situation, and officials generally let it go.

Why "playing the ball" is the key phrase

The simplest test officials use is whether the defender is making a legitimate attempt to play the ball. A defender who looks back for the ball, reaches for it with his hands, and bumps the receiver while doing so is usually fine. A defender who keeps his eyes on the receiver, wraps an arm around him and never looks for the ball is not playing the ball, and the contact is much more likely to be called.

This is why coaches teach defensive backs to find the ball: turning to look for it is the best protection a defender has against being flagged, and it makes an interception possible too.

The penalty in the NFL, college and high school

The biggest difference between levels is the size of the penalty, which is why the same play can feel unfair in one game and routine in another.

Treat the table as a general guide. Rule books are revised on a regular cycle, and state associations can modify the high school rules, so the final authority is always the current rule book for the league you are watching or playing in.

What "spot foul" means in the NFL

In the NFL, defensive pass interference is enforced at the spot of the foul. If a defender interferes 38 yards downfield, the offense gets the ball at that spot and a fresh set of downs. If the interference happens in the end zone, the ball is placed at the 1-yard line, unless the previous spot was already closer than that, in which case the ball goes to half the distance to the goal. That is why a well-timed pass interference call on a deep throw can be worth more than a typical completion.

This is also why you will sometimes hear that defensive pass interference is the best "free yardage" call a team can get. It can be worth 40 or 50 yards, which is far more than many big plays.

At the college and high school levels the penalty is capped at a fixed distance, so a defender who grabs a receiver on a pass that would have gone for 40 yards gives up only 15, though the offense still gets its first down.

Offensive pass interference

The offense is also restricted. Offensive pass interference, or OPI, happens when an offensive player, with the ball in the air, hinders a defender's chance to play it. The most common examples are:

• Pushing off. A receiver extends an arm and shoves the defender to create separation just before the catch. Officials look for a clear, forceful push that changes the defender's balance or path, not a hand placed lightly on the defender's body.
• Picks and rubs. One receiver deliberately runs into or blocks a defender who is covering another receiver, freeing the second receiver. Crossing routes happen all the time; the foul is a receiver who clearly goes after the defender's body rather than running his route.
• Blocking downfield while the pass is in the air. An offensive player who blocks a defender beyond the line of scrimmage on a pass play can be flagged, though the rules treat some contact differently on plays that are screens.
• Pushing off to catch a ball in the air. A receiver who uses his arms to shove a defender out of the way to reach the ball is committing the same foul.

OPI is often called less than DPI, partly because it is harder to see and partly because officials give receivers some benefit of the doubt when both players are fighting for position. When it is called in the NFL, the penalty is shorter than the defensive version and the down is replayed from the previous spot rather than handing out a first down. Check the rule book for your level, because the college and high school details differ.

Contact that is not pass interference

Understanding what the rule allows prevents a lot of confusion. The following are all normal parts of a legal pass play:

• Incidental contact. Two players running at full speed will touch each other. If the contact does not meaningfully affect the receiver's ability to catch, there is no foul.
• Contact while both players are playing the ball. A cornerback and a receiver both reach for a high pass and collide. Neither is hindering the other, because both are doing what the rule permits.
• Uncatchable passes. If the pass is clearly out of reach of every receiver, hindering contact is generally not pass interference. The contact may still be called under another rule, for example illegal contact or holding, if it meets the definition.
• A defender who is blocked into a receiver. If an offensive player's block pushes a defender into the receiver, the defender is not responsible for the contact.
• Contact after the ball is touched. After a tip, either side may play through.

The "uncatchable" idea deserves emphasis because it surprises viewers. Fans often assume that a defender who tackles a receiver deep downfield must get flagged, but if the pass was thrown over the sideline or clearly beyond the receiver's reach, officials may decide there was no pass to interfere with. In that case, a flag is still possible, but it would be for a different foul.

Hail Mary passes

The long desperation throw into a crowd at the end of a half uses the same rule, but the judgments get messier because many players are fighting for position at once. Most contact in that scrum is treated as mutual jostling around a jump ball and is not flagged unless one player clearly hinders another.

How the flag gets thrown

Pass interference is normally called by the official nearest the play. The typical sequence looks like this:

1. The official sees contact on a receiver while the ball is in the air.
2. He judges whether the pass was catchable and whether the contact hindered the receiver.
3. If he decides there was interference, he throws the flag and later reports to the referee exactly what he saw.
4. The referee announces the foul, the team committing it and the enforcement.

Officials are trained to watch the receiver's path, eyes and hands. A defender who looks only at the receiver and reaches for his body, rather than the ball, tends to draw the flag.

Can it be reviewed?

This is one of the sport's best-known rules episodes. The NFL experimented with making pass interference calls and non-calls reviewable by replay for a single season, and the experiment was widely seen as unsatisfactory. It was not renewed after that season, and, as far as the league's rules stand now, pass interference is not a standard reviewable play in the NFL. Check the current rule book, because replay rules have been revisited before. The reasoning was that interference is a judgment call, not a matter of fact like a catch or a foot out of bounds, and that review added delay without much improvement.

If you want to see how replay normally works, read what instant replay can and cannot review.

Common misconceptions

"Any contact before the ball arrives is interference." Not true. The contact must be significant and must hinder the player's chance to make a play. Light contact is common and normal.

"The defender must have his back to the ball to be flagged." Not true either. A defender who is looking at the ball can still commit pass interference if he grabs or pulls the receiver.

"If the receiver would not have caught it anyway, there is no foul." Usually wrong. The standard is whether the receiver had a chance, not whether he would have caught the ball.

"The penalty is always 15 yards." It is at some levels and not at others. In the NFL, the defensive version is enforced at the spot of the foul.

"Offensive pass interference only applies to receivers." The rule can apply to any offensive player who hinders a defender with the ball in the air, including a blocker who engages a defender downfield on a passing play.

What players and coaches do about it

A defensive back who wants to avoid the flag learns a few habits. He keeps his hands off the receiver's torso and arms before the ball arrives, uses his body position to stay close, turns his head to find the ball at the right moment, and plays through the receiver's hands with a clean motion. A receiver learns to use his hands against a defender's chest or arm only in ways that do not clearly shove, to catch the ball at its highest point, and to avoid a crossing route that turns into a block.

If you play recreational or flag football, many leagues use their own pass interference rules, often simplified. Check your league's rule sheet, and see our Play section for ideas about how to organize a game.

How to watch for it on game day

When a flag comes out on a deep throw, try this checklist:

• Was the ball in the air when the contact happened?
• Was the pass catchable? Where did it land compared with where the receiver was?
• Was the defender looking for the ball, or only at the receiver?
• Did the contact come before the ball arrived, and did it change the receiver's route or balance?
• Is this the NFL, where the enforcement is a spot foul, or a level with a fixed distance?

For live results, see scores, and use the teams pages to follow the clubs you care about. For how the penalty yardage is applied, read our guide to penalty enforcement.

The short version

• Pass interference applies only while a forward pass is in the air, from release until the ball is first touched.
• The foul is contact that significantly hinders a player's chance to catch or defend the pass, committed by someone who is not playing the ball.
• Two players who are both honestly playing the ball and collide have not committed a foul.
• A clearly uncatchable pass generally cannot produce interference, though other fouls may still apply.
• Defensive pass interference in the NFL is a spot foul with an automatic first down; college and high school use fixed distances, so check the current rule book for your level.
• Offensive pass interference covers pushing off, picks and downfield blocks while the ball is in the air, and carries a shorter penalty than the defensive version in the NFL.
• Pass interference is not a standard replay review item in the NFL, because it is mainly a judgment call.