Which of the following is a requirement for the delivery of a controlled substance?

The requirement for the delivery of a controlled substance is that the substance must indeed be a controlled one. This means that the substance is classified under a specific category of drugs regulated by law due to its potential for abuse or dependency. Controlled substances are categorized into schedules based on their medical use and the risk of addiction they pose.

For legal distribution, it is imperative that the substance being delivered falls under these recognized schedules established by regulatory bodies. This ensures that the distribution is monitored and that only substances appropriate for medical use are being handled, minimizing the risks associated with illegal drug trade and misuse.

The other options do not align with the fundamental legal requirement concerning the delivery of controlled substances. For instance, while having a license to distribute is important in many cases, the primary criterion is the classification of the substance itself.