I am not sure when it was first added to the NCAA rule book, but it is 
there (in youth hockey, it is part of the tripping rule. In the NHL it 
is a separate rule):

> *Rule 44 - Clipping*
> 44.1 Clipping - A player shall not deliver a check at or below the 
> opponent’s
> knees. Clipping includes all cases in which an attempt to clip is made,
> regardless of whether contact occurs.
> *PENALTY—Minor or major at the discretion of the referee. A game**
> **misconduct or disqualification may be assessed at the**
> **discretion of the referee.*

As you can imagine, it is quite dangerous.

   --david

On 2/12/22 19:27, Carol White wrote:
> There were three Five minute Major penalties in the last five minutes 
> of the game.
>
> Two were for Face masks and the last was a "Clipping" call. WTH??
>
> Since when is there a Clipping penalty in HOCKEY??
>
> Minnesota Sweeps Ohio State.
>
> Thank you!
> Carol,QoGH