Rave/Festivals as Police

Hello, I've recently taken an interest in wanting to join the Met police, i understand the requirements and everything that needs to be done.

My biggest concern is that i regularly go to Legal Raves and Festivals. This alone i understand to be fine. However, due to the nature of the culture, drug misuse is prominent. My question is, do any currently serving police go to raves or festivals off duty, and how do you approach it knowing the level of posesion and use that goes on?