[alex-]

My guess is it's less about a moral issue with marijuana and more about a fear of upsetting people displaying the adds. Many of whom won't want to be associated with something federally illegal. The alternative headline being "Google displays illegal drug adds on school site" (or some other page that probably should not be showing ads)

[paxys]

This has nothing to do with advertising. It applies to apps in the Play store.

[alex-]

Not sure how I missed that, thanks.