The profiling of steroid users based on various physical characteristics seems to be gaining popularity. The federal government appears prepared to use physical characteristics (e.g. changes in muscularity, etc) as indicative of steroid use in the perjury trial of Barry Bonds. Muscularity has been used as putative evidence of steroid use in order to obtain search warrants in Oklahoma. Pro bodybuilders have been detained and forced to submit to drug testing in Sweden simply because of their muscularity.
Muscle profiling isn’t the only type of profiling that has been used in the war on steroids in sports. Some sportswriters use acne as irrefutable evidence of steroid use. For example, Murray Chass has maintained for years that Mike Piazza used anabolic steroids because he observed acne on Piazza’s back. Since (back) acne is a common side effect of steroids, steroid users are more likely to experience acne. However, not all steroid users experience back acne and most people with back acne don’t use steroids.