So it is better to ignore the drugs issue. Ask Joe Public about cycling and drugs will come up quite quickly. I found the little mag quite interesting and well written. It had humour and facts neatly blended together.
Unfortunately drugs is something that is bound to come up throughout the tour, as cycling's still in the transitional stage of weeding them out (as athletics has done in the past, the nfl, etc). Most novice tour watchers won't understand the testosterone/epo jargon, so it's pretty important that it is explained what it i, what is wrong with it, and cycling's approach to counter it.