Ok.. 1st post situation today in a game where i suspected substitutes to be smoking cannabis. Very strong smell coming from their side of the pitch and they had no spectators. Unfortunately i wasnt able to identify the culprit. I waited a short while to try and spot the player but i wasnt able to. I made a point of approaching the manager explaining i could smell cannabis strongly at their side of the pitch and if it was his players he needed to ensure it was stopped immediately. I will be reporting it to league and county but any advice on managing this situation if ot occurs again in future??