The procedures followed by police officers can vary depending on the jurisdiction and the specific circumstances of the traffic stop. While it is not a universal requirement for police officers to take the keys when pulling over a motorcyclist, there may be situations where they deem it necessary for safety or other reasons.
In some cases, if an officer believes that the motorcyclist may pose a threat or is attempting to flee the scene, they may take the keys as a precautionary measure to prevent the individual from driving away. Additionally, if an officer suspects that the motorcyclist may be under the influence of alcohol or drugs, they may take the keys to ensure that the person does not continue to operate the motorcycle while impaired.
It's important to note that laws and procedures can vary between jurisdictions, so it's best to consult the specific laws and regulations in your area or consult with a legal professional for accurate and detailed information.