Putting a knee on the opposition player on the ground is a penalty offence, not fully supporting your own weight. Don't teach it.

This is a very fine explanation of the technique. However, as I have questioned for at least 10 years and none supposedly informed have answered, isn't the ball supposed to be released or placed "immediately"....If that was done, as it used to be through the 1990's, the jackeling technique would NOT be necessary. The ball would be available not cradled by the tackler. Secondly, as soon as the tackled player releases or places the ball, he is OFFSIDE....if he makes no move to "roll away" then shouldn't be be whistled for "offside"? Thus, jackeling unnecessary. Then, why is it necessary to play the ball from behind the back of the tackled player. There's no ruck or maul, so why not just step over or around the player and pick up the ball that he should have released. As recently as 4 years ago these Laws were still on the books....indeed, still should be. A final point, the jackel is in position to be cleaned out with a shoulder charge be an opponent....the same shoulder charge that would be a penalty if applied to a man running with the ball.....ie no attempt to wrap arms...and yet the jackel is in a much more vulnerable position that a ball carrier who can, kick, pass, dodge or fend off a tackler. These are an example of the LAWS as currently refereed that make little sense to me and that clearly encourage the greater number of injuries in the game over the years prior to "Modern game" where brawn and size of players is a keynote feature along with "winning the collision"....the ball has become less important as the "object" and the "brutality" ( as the game is advertised). Lets remember that 4 years ago in Europe alone there were 22 deaths in rugby union and France ( of all folks) admitted to "under-reporting". Such are the reasons that I, who played for 19 years and coached both men's and women's sides, and refereed 100 plus matches, would have no interest in playing the current game nor allow my children or their children to participate. As the numbers of registered players is half in UK and Australia what it once was, perhaps that's a shared view. This was once a "beautiful game", open to all sizes and based on skill, speed, and fitness ( no subs). Not so any longer....but thanks for you explanation none the less.

Cheat is the optimum word, penalty all the way.