Except, unless I am severely mistaken in my understanding, their authority ends at the point of sale. All they are able to regulate is what gets sold and how. They have no ability to regulate what the consumer does with something after it has been purchased.
They most certainly do if not specifically through the released deeming regs they
will either make additional regulations or modify the deeming regs. They have stated
as much in the deeming regs they reserve the right to create new regulations or
modify existing regs in order for them to more effectively regulate the market.
Again this hinges on what the FDA in fact chooses to do. If the FDA chooses to
they can regulate anything used to the manufacture of the juice or hardware
quite easily at point of sale. To demonstrate this head to your nearest drug store
and purchase some sudafed.
When laws are enacted that regulate the use of items the general consensus is
90% of the people will abide by the law. In this case I believe the FDA will not concern
itself if this holds true in the case of our industry. However there have been exceptions to
the 90% consensus most notably prohibition. Prohibition did not ban the legal sales or
consumption of alcohol. Prohibition regulated the legal sales of alcohol for consumption.
One could purchase alcohol legally with a Doctors prescription for medicinal purposes.
(

,

,nudge,nudge) What happened then was the percentage of people consuming
alcohol sky rocketed resulting in more active drinkers during prohibition than before.
I am not certain what the reason for this was but, the governments reaction to this
was to say the least very forceful. All these new drinkers along with the old drinkers
were not buying their alcohol per legally prescribed channels. They were quenching
their thirst with black market alcohol. This effectively stifled the governments control
and regulation of the legal market. The rest is history. It would be quite intersting
to observe the result if a similar scenario resulted in the case of these deeming reg.'s.
Note that the illegal sales also avoided the taxes from legal sales of alcohol.

Regards
Mike