Packers and Stockyards Act, Section 409

Section 409 of the Packers and Stockyards Act regulates that meatpackers pay promptly for livestock that they purchase. It requires that any meatpacker or dealer buying livestock to pay up in full to the seller before the end of the next business day.

Source: Wikipedia — Packers and Stockyards Act, Section 409 (CC BY-SA 4.0)