All background dancer for Britney Spears' upcoming tour are required to have a drug test. With these measures, such as the star apparently wants to make sure that her comeback skandal free runs, and themselves away from negative influences. A close confidant of the blonde reveals in conversation with 'E! News': "All the background dancers had a drug test, and were immediately fired if they do not exist. This is only because of Britney, because she is under strict observation. We want only positive influences around them have. "The precautions seem understandable, given the slow fall of the young singer thinks that in recent months under the eyes of the public has suffered. Since then, the custody of her two sons Sean Preston (3) and Jayden James (2) with father Kevin Federline. Spears itself is under the care of her allegedly kontroll-addicted father Jamie. (BangMedia)