Can't speak for grandparent, but usually this is code for "we had drug problems in the past, _do not want again_." See, being tolerant towards psyche-affecting

Can't speak for grandparent, but usually this is code for "we had drug problems in the past, _do not want again_." See, being tolerant towards psyche-affecting material is only cool up until the party, where irreversible data/PR/marketing loss commences, reversing the hard work of multiple month. TL;DR: know your limits