They should definitely be banned from serving dangerous shots of alcohol. There is no need to serve anything that is potentially dangerous. There are plenty of options that are less dangerous. Why is there a need to take further risk. Bars have plenty of options and can easily make this change.
I feel that bars should be banned from serving shots that have the highest potential of leading to dangerous outcomes. Being under the influence at all adds a risk to both the person consuming the alcohol and those around them, but those are risks that people take when drinking. However, being served a shot that has the potential for danger after the consumption of just one should be banned to save both the consumer and others the risk of its side effects.
A top priority of a bar is the health and safety of their patrons. So, by serving their customers potentially dangerous shots of alcohol not only jeopardizes their health and safety, but it also prevents someone from coming back to that bar. You could not only lose out on their business, but also the business of any of their friends or family.
No way bars should be prevented from serving potentially dangerous shots of alcohol. Bars already are held to high legal standards. Who is to define what is considered a "dangerous shot"? All alcohol is potentially dangerous. The only way to prevent accidents is a complete prohibition of alcohol. And we all know how that once worked out.