Labyrinthine state restrictions that date from Prohibition are gradually changing, creating an opportunity for interstate sales to customers in as many as 26 states.

The F.D.A. considered banning all interstate sales of raw milk in 1973.

The power to regulate prices on interstate sales of electricity belongs to the Federal Energy Regulatory Commission, a low-profile independent agency.

One species, rhododendron chapmanii, has been given Federal designation as an endangered species, a label that mainly places restrictions on interstate sales.

It regulates the interstate sales of securities and made it illegal to sell securities into a state without complying with that state's laws.

They argue that the Supreme Court has held that the 21st Amendment gives states wide latitude in regulating interstate sales of liquor.

However, this act still did not cover the regulation of interstate sales.

Today the American wine industry faces the growing challenges of expanding international exports and dealing with domestic regulations on interstate sales and shipment of wine.

Some states allow interstate sales through e-commerce.

It would allow them to force companies to collect all taxes due on interstate sales.