World rugby released a memorandum on dangerous tackles a couple of days back; clarifying two aspects and reemphasizing the need to take tackles around the neck and head out of the game.
Even though they may not technically be a tackle, the following situations are to be considered as dangerous play, and acted on accordingly:
1) the “alligator roll” clear out at the breakdown, where a player removes an opponent by binding on to them and rolling off the breakdown. If the contact is above the line of the shoulders (armpits in youth rugby) it is dangerous play.
2) the “choke tackle”, where a potential tackler grasps the ball carrier high, in an effort to prevent him/her going to ground. If the contact is above the shoulders (armpits in youth rugby) then it is dangerous play.