http://bleacherreport.com/articles/2034597-report-nick-calathes-faces-20-game-suspension-for-breaking-banned-substance-ban
http://www.medicinenet.com/tamoxifen/article.htm
http://www.wada-ama.org/Documents/World_Anti-Doping_Program/WADP-Prohibited-list/2013/WADA-Prohibited-List-2013-EN.pdf
S4. HORMONE AND METABOLIC MODULATORS
The following are prohibited:
1. Aromatase inhibitors including, but not limited to: aminoglutethimide,
anastrozole, androsta-1,4,6-triene-3,17-dione
(androstatrienedione), 4-androstene-3,6,17 trione (6-oxo),
exemestane, formestane, letrozole, testolactone.
2. Selective estrogen receptor modulators (SERMs) including, but not
limited to: raloxifene, tamoxifen, toremifene.