How much pseudophedrine can a person purchase in a month?

In the context of regulating the sale of pseudoephedrine, federal law established a limit on the amount that can be purchased by an individual within a specified time frame to help control the potential for misuse in the production of methamphetamine.

According to the law, an individual may purchase no more than 9 grams of pseudoephedrine in a 30-day period, regardless of whether the purchase is made in a single transaction or multiple transactions at different locations. Therefore, the correct choice suggests a limit of 7.5 grams, which is consistent with state regulations accommodating the federal law.

It's important to note that purchasers are required to show identification, and retailers must keep a log of sales, which further helps regulate access to this substance. Each state may impose additional limitations, but they cannot allow for a greater amount than set by the federal guidelines.

Thus, the correct answer reflects a standard limitation that aligns with these regulations.