Right, just like the states alone cannot make Schedule I substances legal for consumption and sale.

Except, of course, that half the country does it[1].

We are living in a strange country.

[1]http://www.governing.com/gov-data/safety-justice/state-marij...

Tell that to Indiana.

https://en.wikipedia.org/wiki/Time_in_Indiana

That article goes into a long history of the interplay between state and federal authority in terms of time zones - most of it Indiana acting within the bounds set by congress or petitioning congress to give them exemptions.