Drinking alcohol that has passed its expiry date is generally safe, as long as it has been stored properly. Unlike many other food and beverage products, alcohol does not spoil or become unsafe to consume after its expiration date. However, there are a few factors to consider before consuming expired alcohol.

1. Storage Conditions: The most important aspect to consider is how the alcohol has been stored. Alcohol should be stored in a cool, dark place, away from direct sunlight and extreme temperatures. Exposure to heat, light, or air can lead to changes in flavor, quality, and potency over time.

2. Packaging: The type of packaging also affects the shelf life of alcohol. For example, beer stored in cans is less likely to be affected by light and air compared to beer stored in clear glass bottles. Similarly, spirits with higher alcohol content, such as whiskey or vodka, tend to have a longer shelf life due to their ability to inhibit bacterial growth.

3. Quality and Taste: While expired alcohol may not be harmful, it may not taste as good as fresh alcohol. Over time, the flavors and aromas of alcohol can change, resulting in a less enjoyable drinking experience. This is particularly true for wine, which can develop a "vinegar-like" taste when past its prime.

It is important to note that these guidelines apply to commercially produced and properly stored alcohol. Homemade or poorly stored alcohol may carry additional risks. If you have any doubts about the safety or quality of expired alcohol, it is best to discard it.

References:

1. "Does Alcohol Expire?" Healthline, www.healthline.com/health/does-alcohol-expire.
2. "Does Alcohol Go Bad? Shelf Life, Storage, and More." Taste of Home, www.tasteofhome.com/article/does-alcohol-go-bad/.