For how long must controlled substance inventories be maintained?

In the context of controlled substance inventories, the correct duration for which these records must be maintained is two years. This requirement aligns with federal regulations set forth by the Drug Enforcement Administration (DEA), which stipulate that registrants must keep records of all controlled substances on hand as well as records of the receipt and disposal of controlled substances for a minimum of two years.

Maintaining these records for two years is crucial for compliance and accountability, enabling regulatory agencies to monitor the distribution and usage of controlled substances and to ensure proper handling and security to prevent misuse or diversion.

The other options suggest different time frames, but they do not reflect the current regulations regarding the maintenance of controlled substance inventories. Therefore, knowing that a two-year period is the legally mandated timeframe ensures that pharmacists and pharmacy technicians remain in compliance with both state and federal laws. This understanding reinforces the importance of thorough record-keeping practices within pharmacy operations.