What can the ball carrier not do to avoid being tagged?

The player in possession:

• cannot fend off defenders, or protect the tag by using the arm or ball to fend;
• cannot jump through or at the defensive line to avoid being tagged;
• cannot run directly at a defender, and should be penalised if a collision occurs;
• cannot perform a 360 degree turn through or at the defensive line to avoid being tagged, and is penalised if they do;
• cannot surrender before being tagged; and
• if they drop on a loose ball, cannot stay on the ground waiting to be tagged if they have time to regain their feet and continue play.

Defenders cannot tag unless both of their own tags are attached, and cannot tag or obstruct a player who is not in possession of the ball.

Source: NRL League Tag Laws of the Game (Official 2018), International League Tag Laws section 7.