State laws dictate whether or not you can get a DUI while you're on your bike, so it's important to look into the local laws, as they vary a lot from one place to the next. So, can you get a DUI on a bike—often called a BUI—in Maryland?
In short, yes, you can get a DUI if you're intoxicated or under the influence of drugs while you are riding your bike. You do not have to be in a car, truck, SUV or some other type of motor vehicle. The laws in Maryland are simply written to address vehicles, and they state that bikes count as vehicles. This means that, due to the construction of the law, cyclists are subjected to the same regulations as drivers.
As noted, this isn't true everywhere, but it is true in the majority of the states. Only 19 of them say that bikes do not count as vehicles, for example, which can get people out of DUI charges. In the other 31 states, a bike is always thought of as a vehicle.
This is important because people sometimes think of a bike as a way to skirt the law. If you know you're going to be drinking too much to drive, why not just bring your bike to the bar or restaurant and pedal your way home? While it could be argued that this is safer for other drivers, it is still illegal in Maryland.
If you've been given a DUI on your bike, you definitely want to know what the state laws are and what legal options you have.
Source: Bike League, "Bicycling Under the Influence," accessed April 07, 2016