Which of the following is a method associated with the production of methamphetamine?

The Birch/Nazi method refers to a specific illicit procedure utilized in the synthesis of methamphetamine. This method employs lithium or sodium combined with anhydrous ammonia to reduce ephedrine or pseudoephedrine, transforming these legal medications into methamphetamine. It's often favored among drug manufacturers due to its relatively straightforward technique and the availability of the precursor chemicals, which are commonly found in over-the-counter cold medications.

Understanding this method highlights the risks associated with methamphetamine production, including hazardous chemicals and potential safety concerns, both in the manufacturing process and in the surrounding environment. The increased awareness of such methods is vital for law enforcement and regulatory agencies aiming to combat illegal drug production effectively.