A general guideline for rule crafting that I have seen been important in sport over and over and over again is: Never disallow something you cannot enforce. Do

A general guideline for rule crafting that I have seen been important in sport over and over and over again is: Never disallow something you cannot enforce. Doing so causes people to have to make the choice of losing or being a liar. This is in part how cycling became such a mess, when there was an era where either you do EPO and lie, or retire. Because EPO was not allowed but could not yet be detected.