The 400,000 figure does not seem to exist anywhere else online. Searching "400,000" and "rape" returns no results regarding date rape, the closest results I can find relate to the number of rape survivors in the Congo (400,000). This wikipedia article on date rape suggests that roughly 2% of date rape victims have been drugged, so if the 400,000 figure is to be believed that means there are 20,000,000 date rape victims every year? That seems... unbelievable! This figure seems to be pulled out of nowhere. Also worth mentioining that the #1 date rape drug is... alcohol! This article smells a lot like FUD. http://en.wikipedia.org/wiki/Date_rape_drug#Frequency_of_occ...

edit: and in the video the project creator claims over a million people are victims every year, again no citation.

edit edit: found a study that claims 4% of rape victims had been drugged[1] and according to RAINN there are ~200,000 rape victims every year[2]

[1] https://www.ncjrs.gov/pdffiles1/nij/grants/212000.pdf

[2] http://www.rainn.org/get-information/statistics/frequency-of...

So assuming the RAINN figure is accurate and the study figure is accurate that means there is ~10,000 drug involved date rapes per year.