Considered harmful considered harmful
“In a roadside study, one in three reckless drivers who were tested for drugs tested positive for marijuana. It’s more harmful than we all thought.” Gnrgh! Meaningless! How many other drivers tested positive for marijuana? Was the ratio of reckless to non-reckless drivers different for those testing positive than those testing negative? Were all the reckless drivers stopped tested? The language quoted implies that they weren’t, so what factors determine who were tested and who weren’t? ...