What requirement must be fulfilled if a purchaser of methamphetamine products is required to show identification?

When purchasing methamphetamine products, there are specific requirements related to identification to ensure compliance with federal and state regulations aimed at controlling the sale and distribution of such substances. The correct answer indicates that all proposed requirements apply.

Firstly, individuals must be at least 18 years old to purchase methamphetamine products, which is why showing identification is mandatory for anyone falling into that age range. This requirement ensures that the products do not fall into the hands of minors.

Secondly, the identification must include a photo to help verify the identity of the purchaser. This measure is crucial for preventing unauthorized or illegal purchases, as it allows the seller to confirm that the person presenting the ID is indeed the individual whose name appears on the identification.

In addition, the identification must include a signature. This serves as an additional layer of verification, allowing the seller to compare the signature on the ID with the signature of the purchaser at the time of the transaction.

Therefore, the comprehensive nature of the requirement—covering age verification, photo identification, and signature—highlights the stringent measures in place to monitor the sale of controlled substances and prevent misuse. This is why the answer encompassing all these conditions is the correct choice.