SRSport Rules
Gridiron football - pass plays

Pass interference, explained.

Pass interference is illegal contact that materially prevents an eligible opponent from having a fair chance to catch a forward pass. This page covers American and Canadian-style football in general terms. The core idea is shared, but exact penalties, replay rules, and enforcement spots vary by league.

Quick ruling: look for a catchable forward pass, eligible players competing downfield, and contact that significantly restricts the chance to catch. Incidental contact, equal rights to the ball, and uncatchable passes usually point away from interference.
Decision path

How the call is made

  1. Confirm that the play involves a forward pass from behind the line of scrimmage or neutral zone.
  2. Identify the eligible receiver or defender who had a real opportunity to make a catch.
  3. Judge whether the contact happened before the ball was touched and beyond the area where ordinary line play is allowed.
  4. Decide whether the contact materially restricted the opponent, such as by grabbing, hooking, driving through the back, arm-barring, cutting off the route with contact, or pushing off to create separation.
  5. Apply the code in use. Defensive pass interference and offensive pass interference are punished differently, and the yardage or spot enforcement is not identical in every league.
What changes it

Details fans miss most

  • Both players can play the ball: a defender is not required to yield space just because the pass is coming.
  • Restriction matters: light hand contact is not enough if it does not affect the opponent's chance to catch.
  • Timing matters: once the pass is touched, pass interference restrictions usually end, though other fouls can still apply.
  • Catchability matters: contact on a clearly uncatchable throw is usually not pass interference.
  • Offense can interfere too: pushing off, blocking downfield too early, or setting an illegal pick can be offensive pass interference.
DPI and OPI

Defensive vs offensive interference

Defensive pass interference usually means the defender illegally restricted the receiver's chance to catch the ball. Common examples include grabbing an arm before the ball arrives, playing through the receiver's back, or hooking the receiver so their body turns away from the pass.

Offensive pass interference usually means the receiver or another offensive player gained an unfair advantage. Common examples include a clear push-off to create separation, blocking downfield before the pass is thrown or arrives, or deliberately screening a defender on a pick route beyond the allowed contact area.

Not interference

Legal contact and exceptions

  • Incidental contact: feet can tangle and bodies can brush while both players are honestly playing the ball.
  • Established position: a player who has gained legal position can hold that path while trying to catch or defend the pass.
  • Contact near the line: early contact close to the line may be legal or may be a different foul, such as holding or illegal contact, depending on the code.
  • No real chance to catch: if the ball is clearly too far away for the affected player, officials normally do not call pass interference.
Common argument

"The defender never looked back"

Not turning to look for the ball can make the defender's actions look worse, but it is not always a foul by itself. Officials still need meaningful restriction before calling pass interference. A defender who maintains legal position without grabbing, blocking, or playing through the receiver may avoid a flag even without turning their head.

The opposite is also true: looking back does not make illegal contact legal. If the defender hooks an arm, grabs the receiver, or drives through the body before the ball arrives, the fact that they were looking for the pass will not usually save the play.

Enforcement

Why penalties differ

Pass interference is one of the rule areas where league differences matter. In the NFL, defensive pass interference is commonly enforced at the spot of the foul with an automatic first down, while offensive pass interference is a yardage penalty from the previous spot. College, high school, Canadian, and flag football codes may use different yardage, automatic first-down, loss-of-down, or replay-review rules.

For a practical read, separate the foul from the penalty. The foul is about illegal restriction during a pass play. The penalty is whatever the governing rulebook for that game says to enforce.