9.28 Controlled Substance-Possession or Distribution of Listed Chemical (21 U.S.C) is a federal law that prohibits the possession or distribution of a listed chemical with the intent to manufacture a controlled substance. The listed chemicals are precursors to the production of illegal drugs, such as methamphetamine, and are often used in the illegal production of drugs. It is illegal to possess or distribute any of the listed chemicals without a valid prescription or authorization from a licensed professional. The listed chemicals can be divided into two categories: essential and non-essential. Essential listed chemicals are those that are essential for the production of a controlled substance, such as ephedrine, pseudoephedrine, and iodine. Non-essential listed chemicals are those that are not essential for the production of a controlled substance, such as red phosphorus and phenyl-2-propanone. It is illegal to possess or distribute any of the listed chemicals without a valid prescription or authorization from a licensed professional. Violators of this law face serious criminal penalties, including fines, imprisonment, and asset forfeiture.