Running an addiction treatment center or pharmacy comes with its fair share of problems. Most of these stem from the fact that such facilities deal with many different controlled substances. And sometimes, health workers and patients suffering from addiction try stealing them when their supplies run dry. If you want to learn more about the safe storage of controlled substances, this piece is for you.   Fundamentals of Controlled Substances Controlled substances are prescription, controlled drugs, or medication that the United States CSA (Controlled Substance Act) regulates since they have a high potential for dependence and abuse.