SCANNING IS IMPORTANT
Vision and Scanning are important to see if a player drags the landed foot. Try to scan back to the player with the ball upon release of the ball.
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From the Rule Book:
9.6.3 Other Foot Movements
A player in possession of the ball may not:
(i) Drag or slide the landing foot.
Whistle + Signal (Terminology) Dragging-Free Pass
9.6 Footwork 9.6 3 (i) drag
In all other situations use footwork