This staff confirmation shows how it's possible for the use of banned drugs to cost a student-athlete two seasons of competition in one academic year:
Season of Competition and Banned Drugs (I)
Date Published: December 2, 2010
Type: Staff Interpretation
The academic and membership affairs staff confirmed that a student-athlete who, as a result of a drug test administered by the NCAA, is found to have used a substance on the list of banned drug classes automatically loses one season of competition, regardless of whether the positive test occurs prior to or during the institution's playing season in the applicable sport. Further, if a student-athlete has participated in intercollegiate competition during an academic year prior to the positive drug test or participated in intercollegiate competition during an academic year after the restoration of his or her eligibility, the student-athlete also uses a season of competition per NCAA Bylaw 14.2.3.1. Consequently, it is possible for a student-athlete to be charged with the use of two seasons of competition during one academic year as follows:
2008-09 season: Student-athlete competes entire season. (Use of Season No. 1)
2009-10 season: Student-athlete competes in first four contests (Use of Season No. 2- minimum amount of competition), tests positive for a banned substance and is declared ineligible for further participation in postseason and regular-season competition in accordance with the ineligibility provisions of Bylaw 18.4.1.5.1. (Automatic charge of Season No. 3- banned drug penalty)
2010-11 season: Student-athlete sits out 365 days and the next four contests of the season (including postseason contests if the institution’s team qualifies). Student-athlete competes in last four contests of the season. (Use of Season No. 4-minimum amount of competition)
[References: Bylaws 14.2.3.1 (minimum amount of competition); 18.4.1.5 (ineligibility for use of banned drugs) and 18.4.1.5.1 (duration of ineligibility)]