What is the maximum quantity of pseudophedrine a person can purchase in one day?

In the context of purchasing pseudoephdrine, federal and state regulations set limits due to concerns about its potential use in the illicit manufacturing of methamphetamine. Under the Combat Methamphetamine Epidemic Act (CMEA) of 2005, individuals are restricted to purchasing a maximum of 3.6 grams of pseudoephdrine per day. This regulation is in place to help control access to this precursor drug while still allowing consumers to obtain it for legitimate medicinal purposes, such as for the relief of nasal congestion.

The daily limit is significant in ensuring that individuals do not misuse the substance while balancing public health interests. To further reinforce this regulation, additional restrictions may apply at the state level, but the federal limit establishes a baseline. Hence, the correct answer is based on this established federal guideline regarding the quantity that can be purchased in one day.