After the National Football League Banned the Distribution of Amphetamines

After the National Football League banned the distribution of amphetamines in 1971,

A) random urine tests were used to make sure the players were not taking them.
B) there were half as many injuries as before the ban.
C) individual players could still get a prescription and use amphetamines if they wanted.
D) the ban was ignored,and most teams still bought amphetamines in large quantities for their players.