Shining the ball is one way of tampering, saliva is an agent may be from mouth but when it come out of it, it is is equal to sand paper there is no difference, as such spinners also should not use saliva and dust from the soft mud it is also one way of ball tampering it should be natural remove the shine from one side of the ball and another side to remain and make more shining it should be considered as ball tampering, when technology is so much improved why not these to be considered ball tampering?
