this sentence is correct.

Nitrite is a toxic substance. Long-term or large intake will do harm to human body, and may even cause death. Therefore, the state expressly prohibits the use of nitrite in the catering industry. Catering service providers, as food producers and providers, must strictly abide by relevant laws and regulations, and may not purchase, store or use nitrite. If you violate the regulations, you will be severely punished.