You can't. Although you can make players think twice with random drug tests, you cant fully get rid of them.
steroids
Drugs slower the nervous system.
Drugs in sports came around 1970.
steroids
steriods
ROIDS
Barack obama.
weed
Meradona.
steroids
The agencies that help to prevent drugs are PNP, DOH, DEPED, BFAD etc.
the "punishment" for taking any type of band drugs can range from a number of games suspend to being band from the sport ...