All records of controlled substances must be kept for how long under federal law?

• A. 1 year
• B. 2 years
• C. 3 years
• D. 5 years

Answer: (B)

The key idea is the federal requirement to retain controlled-substance records for two years. This two-year period creates an adequate audit trail of all receipts, distributions, and dispositions, allowing inspectors to review transactions and spot discrepancies or potential diversion over a meaningful span of time. It also aligns with biennial inventories, which are conducted every two years. While other retention periods may apply in different contexts or under state rules, the standard federal requirement for most controlled-substance records is two years.