Law against something           When
---------------------           ----
cocaine, heroin, absinthe       1900s (1906?)
alcohol                         1920 (re-legalized in 1933)
cannabis                        1930s (1939?)
various downers                 1965
LSD                             1968
"Controlled Substances Act"     1970
MDMA                            1985
"C.S. Analogue Act"             1987?