The AP's analysis corrected for the fact that players in different positions have different body types, so speedy wide receivers weren't compared to bulkier offensive tackles. It could not assess each player's physical makeup, such as how much weight gain was muscle versus fat, one indicator of steroid use. In the most extreme case in the AP analysis, the probability that a player put on so much weight compared with other players was so rare that the odds statistically were roughly the same as an NFL quarterback throwing 12 passing touchdowns or an NFL running back rushing for 600 yards in one game.
Each user experiences their own unique feelings when using steroids and coming off the drug. When someone chooses to stop using they can experience a variety of withdrawal symptoms linked to addiction. Symptoms can include mood swings, fatigue, restlessness, loss of appetite, insomnia, reduced sex drive, the desire to take more steroids, and depression. Evidence for steroid addiction is certainly not as strong as it is for other drugs like cocaine or heroin. Though it is clear that people develop a tolerance and dependence on them and willingly experience negative consequences when using steroids - both of which are signs for drug dependence.
The number of players who have admitted using steroids in a confidential survey conducted by the NCAA since the 1980s has dropped from percent in 1989 to percent in 2003.  During the 2003 season, there were over 7,000 drug tests, with just 77 turning up as positive test results.  Scukanec claims that methods were used to get around the drug testing, whether it be avoiding the tests by using the drugs during the off-season, or flushing the drugs out of your system. This was used with a liquid he referred to as the "pink."  He stated: