It will be interesting to see if the NFL ever ventures it's token games across the pond onto the European mainland. Many of those countries are insanely aggressive against performance doping, and they can, have and will raid team hotels and buses without warning and without any notice for search and seizure required - anti-doping authorities in France and Italy can require bio samples on demand, and probably would the moment the first NFL team passed through customs. Likely the NFL will stay in England.