All **vehicle drivers**, including **cyclists**, are required to undergo alcohol and drug testing in certain situations. These situations include:

- Having been involved in a **traffic accident**.
- Showing **symptoms** of driving under the influence of alcohol or drugs.
- Being reported for **traffic violations**.
- Passing through a **preventive alcohol and drug control**.

The law is clear that all drivers, regardless of the type of vehicle, must comply with these tests when requested. Refusing to do so can result in **fines and penalties**. This includes cyclists, as they are also considered vehicle drivers.