State legislation restricting illicit drugs don't require explicit "allowance" by the state's constitution. Virginia's requires it:
Article I, Section 17. Construction of the Bill of Rights.
The rights enumerated in this Bill of Rights shall not be construed to limit other rights of the people not therein expressed.
Uh huh. Find a single instance where a Virginia court has held that the use of illicit drugs is considered to be among the "other rights of the people not therein expressed."