In 1969, Timothy Leary challenged the Marihuana Tax Act of 1937 in Leary v. The United States. Leary claimed that the requirement to have a tax stamp to possess cannabis, while also requiring possession of the illegal cannabis to obtain the stamp, was self-incriminating and unconstitutional. The Supreme Court ruled in his favor on May 9, 1969.
A year later, Congress enacted the Controlled Substance Act, and to this day they use the Commerce Clause of the Constitution to outlaw cannabis. The CSA was effective on October 27, 1970.
Does this mean cannabis (and any other previously banned substance) was legal under federal law for 17 months between 1969 and 1970?