A horse-collar tackle is grabbing the inside of a runner’s collar – shoulder pads or jersey, nameplate included since 2016 – and immediately yanking him down. It costs 15 yards, an automatic first down, and usually a fine.
The ban is the “Roy Williams Rule,” written after one safety’s signature takedown broke too many legs in 2004. Here’s the full rule.
NFL RULES
The Horse-Collar Tackle
One grip, one rule
THE FOUL
Collar grab + pull-down
Inside the back collar, immediately yanked down
THE PENALTY
15 yards
Personal foul, automatic first down
THE ORIGIN
The Roy Williams Rule
Banned in 2005 after a season of broken legs
THE EXCEPTIONS
Pocket QBs, tackle box
The grab is legal in close quarters
The horse-collar tackle, defined
The tackle that broke too many legs
| Element |
Detail |
| The definition |
Grabbing the INSIDE of the back or side collar of the shoulder pads or jersey and immediately pulling the runner down – both parts required |
| The nameplate expansion |
Since 2016, grabbing the jersey at the nameplate area and yanking down counts too – closing the “I grabbed below the collar” loophole |
| The penalty |
15 yards and an automatic first down – personal-foul territory, with fines routinely following |
| Why it’s dangerous |
The runner’s legs get trapped under his own falling weight plus the tackler’s – the injury mechanism is broken legs and shredded ankles, not head contact |
| The exceptions |
A quarterback inside the pocket and a runner inside the tackle box CAN be collar-tackled – close-quarters play where the whipping-down mechanism can’t develop |
| The immediacy requirement |
The pull-down must be immediate – grab the collar, ride the runner five yards, and drag him down gradually, and it’s legal |
The Roy Williams Rule
How one safety changed the rulebook
| Chapter |
Detail |
| The 2004 season |
Cowboys safety Roy Williams’ signature collar-yank takedown broke multiple players’ legs in a single season – the highlight reel became evidence |
| The 2005 vote |
Owners banned the technique that offseason – one of the rare rules named, informally and permanently, for the player who inspired it |
| Williams kept doing it |
He drew repeated fines and a suspension for violations after the ban – the rule’s namesake became its most penalized offender |
| The expansions since |
College and high school football adopted versions, and the NFL added the nameplate clause in 2016 – the rule has only ever grown |
HORSE-COLLAR FACTS
The name is literal
The grip mimics grabbing a horse’s collar from behind – old ranching vocabulary that stuck to a football foul.
Hair is fair game
Pulling a runner down by his hair is legal – the ponytail is considered part of the uniform, the collar is not.
Flag rates stay low
It’s among the rarer personal fouls – a few per season league-wide – because defenders genuinely changed technique.
A Rule Written by Injuries
The horse-collar ban is player-safety legislation at its most specific: the injury mechanism – legs trapped under the combined falling weight – was so distinctive and so devastating that the league outlawed one grip rather than a category of contact. The exceptions for pocket quarterbacks and tackle-box runners track the physics: in close quarters the dangerous whip-down can’t develop. Like the 10-second runoff, it’s the rulebook closing one specific exploit with one precise rule. Official definitions live at NFL Football Operations.
The Bottom Line
Inside the collar or nameplate, immediate pull-down, 15 yards and a first down – with pocket QBs and tackle-box runners exempt. The horse-collar tackle went from signature highlight to named foul in one offseason, and the injuries it caused are why.
