It is but it is sold sealed in the bottle. You cannot breach the seal, empty the bottle, and then refill no matter what. Barkeeps have been known to sell off brands this way so you pay top shelf prices for rot got or watered liquor
They used to have to break the necks out of the empty bottles or the could be fined.
Or rubbing alcohol
A TGI Fridays in East Windsor New Jersey got caught doing that. They got away with just paying a fine to the state.