What is the maximum quantity of pseudoephedrine an individual can purchase in a 30-day period?

In the context of pseudoephedrine regulation, the correct answer of 9 grams reflects the legal limit set forth by federal and state laws, including the Combat Methamphetamine Epidemic Act (CMEA). This act specifically limits the purchase of pseudoephedrine, which is a key ingredient in the illegal synthesis of methamphetamine, to curb its misuse while still allowing for legitimate medical use.

Under these laws, an individual may purchase a maximum of 9 grams of pseudoephedrine within a 30-day period, ensuring that regulations are in place to monitor and control access to this substance. This is an important regulatory measure intended to mitigate the risks associated with substance abuse while still meeting the needs of patients requiring decongestants for legitimate health reasons.

The other quantities listed are either higher than the established limit or are not in alignment with the regulations set by the CMEA, which defines the controlled amount allowable for individual consumers. Therefore, the correct answer accurately reflects current regulations that govern the sale of this over-the-counter medication.