Tenerife is easily accessible for testers, but what is the point of them going there? They can find passport irregularities in the riders, but there is no way they can do anything with them. If, for example, they find that a rider who has been staying in the Parador at 2,000m for a couple of weeks has much higher than normal hct, they have no way of knowing whether that is down to altitude or doping. It provides the perfect cover. There are nowhere near enough studies and research into the long and short term effects of altitude training for the testers to really go after a rider.