Lance Armstrong... greatest doper there was or ever will be

What other sports are rife with doping?

Golf, clearly. Beta blockers and the like.
Tennis is apparently awash. Poor Timmy failed because of it and his failure to dope.
Baseball
American football
Football.
Snooker
Darts
Beach volleyball
Cricket

Any more?

Athletics, Gymnastics, Weight-lifting, Swimming.
Rugby (both codes)