What is a restriction for individuals concerning access to controlled substances in a pharmacy?

The correct answer is based on the principle that individuals with a revoked DEA registration are prohibited from accessing controlled substances in a pharmacy. A revoked DEA registration indicates that an individual has previously lost their legal right to handle controlled substances due to violations such as misconduct, potential drug abuse, or failure to comply with regulatory requirements. Allowing access to controlled substances for someone with a revoked registration would pose a risk to the public, as these individuals may have been deemed untrustworthy in their handling of controlled substances.

The other options do not inherently restrict access to controlled substances based solely on the criteria provided. For instance, having a high school diploma, experience working in other pharmacies, or even lacking a license does not necessarily disqualify someone from accessing controlled substances as long as they are under the supervision of someone authorized or working within legal regulations. The key issue of legal standing regarding controlled substances centers around the status of the DEA registration, making it the primary point of restriction in this context.