The 27-year-old Saracens lock toured the Americas as part of Steve Borthwick's side over the summer and retained his place in the squad for the Quilter Nations Series.
Campbell, who returned to the 15-a-side game in the summer following her time with GB Rugby Sevens, is confident doping issues are an exception, as opposed to the rule, in the sport that has grown exponentially in the last few years.