I was always careful, my parents never caught me with illegal substances, yet strangely they would confiscate and throw out tea that I bought from happy high herbs mainly because it came in a big baggy, and it looked like something illegal.
back in the good old days when BZP was legal, my folks intercepted 1kg of it as it arrived in the mail, to which I argued and got them to agree that its better knowing what i'm taking rather than having random mystery pills with cute pics on them.
because it was legal back then, they let me keep it