[Mrs. Don-o]

"Which [constitutional] provision guarantees a druggist the right to pick and choose which drugs to sell?"

One doesn't need a specific constitutional "provision" to establish the innumberable number of rights to free activity, including economic activity, which comprise the concept of "liberty." The Ninth and Tenth Amendments cover it:

"The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people."

and

"The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."

What this means is that you have a right to do what isn't prohibited by law. The includes the right of vendors of goods and services to decide which goods and services they will vend, and how, and when, and to whom.

[cryptical]

What this means is that you have a right to do what isn't prohibited by law. The includes the right of vendors of goods and services to decide which goods and services they will vend, and how, and when, and to whom.

But you also have to follow the law when it specifies which goods and services licensed vendors will have to vend in order to keep their licenses, right?

[edsheppa]

Your post doesn't make sense. If that provision actually establishes rights to free activity, including economic activity then economic activity cannot be regulated and so there can be no question of whether an activity is permitted by law because such laws would be unconstitutional.

But your conception of the Amendments is obviously wrong because economic activity has always been regulated by state and local governments.