Ha, this topic again?
I come from a background where it was a MUST to have to hide shit from parents; I had been doing this since I was a teen. Although I got caught with substances in my early twenties, at least with my dad, he's not going to give a rat's ass as long as I'm successfully being productive with my life. My mom would have a heart attack though, lol.
Other adults? Nah, they don't care either. They know that I know what I'm doing.
You just have to plan better, or like I said many months ago, go get a hotel staked out. Go out for a hike or one of those recreational parks with trails. It's not much different than having to hide anything from parental figures; the generational gap is too steep for full comprehension, so we all had to hide going to clubs, raves, parties, etc. It's not like we told our parents about those nights, or about how we went to a party with one of my gf's ex-friends and someone got stabbed there, so the cops showed up and questioned all of us, etc. Needless to say, the offender was gone and the rest of us who stayed behind were innocent, but the point is none of us went home and told our parents what happened. It would just create a lot of commotion that would end up being useless and a waste of stress, since none of it was within our control. It just stayed within our circle, and my gf's ex-friend is an ex-friend for a reason.
But I kind of saw substance use the same way; it's all dependent on the user. Yes, you can get away with it and have fun, but that also depends on how well you know your parents and what their belief systems are (if not, do it somewhere else). Do they really care about your substance use, or do they just care about your well-being and what you're going to become in life? Many people are varied and deal with varying situations, so the answer isn't so simple. People only know their own situations so use your best judgment.