The 21-Foot Rule

The so-called "Tueller Rule" is widely misunderstood. It is not a rule, a law, or a justification for deadly force. It is simply a demonstration of timing.

What it shows is this:

If an average person with a knife starts approximately 21 feet away and charges at an average speed, and you have an average ability to recognize the threat, draw your firearm, and fire accurate rounds center mass—you are likely going to get stabbed.

That's it.

It does not mean:

It is not about legal justification. It is about human performance and reaction time under stress.

The Critical Reality Most People Miss

Even if you successfully draw and fire center mass, the threat does not stop immediately.

A person who has been shot center mass can still:

At contact distance, seconds are everything.

So the likely outcome in that scenario is not:

"Officer shoots suspect and survives"

It is:

"Both individuals are mortally wounded"

What the Tueller Concept Should Actually Teach

The real lesson is not about when to shoot—it's about how to avoid being in that position in the first place.

It should reinforce:

Because if you are standing flat-footed, reacting to a sudden knife charge inside that distance, you are already behind the curve.

Operational Takeaways for Law Enforcement

Bottom Line

The Tueller Drill does not tell you when to shoot.

It tells you how fast you can lose.

And if your plan begins at 21 feet with a reactive draw, your outcome is already compromised.

The Tueller Drill does not tell you when to shoot. It tells you how fast you can lose.