While at the grocery store, I overheard the cashier ask a young woman for identification. The young woman was buying cough syrup. I was amazed to overhear that some OTC medications require that you be 18 years old to purchase them in California. After the young woman proved she was of age and left the store, I asked the cashier how long this has been a law. She told me that it has been around for about 4 years. In addition, there is a quantity limit on certain types of medication due to illegal drug production.