True or False: Officers need reasonable suspicion to stop vehicles at a checkpoint.

The statement is true because, under the Fourth Amendment, law enforcement officers are required to have reasonable suspicion to conduct a stop. This principle applies to vehicle checkpoints as well. Reasonable suspicion implies that an officer has specific and articulable facts that a crime may be occurring or that a particular vehicle or driver may be involved in criminal activity.

However, vehicle checkpoints are a special case where stops are allowed without individual reasonable suspicion of wrongdoing, but they must still comply with established legal frameworks, which often focus on the need for the checkpoint's purpose to be related to public safety (e.g., DUI checkpoints). Officers do not need probable cause to stop vehicles at these checkpoints, yet the havens of reasonable suspicion and legal justification for the checkpoint itself still apply.

Other options suggest conditions under which reasonable suspicion might not be necessary, such as only stopping vehicles when a violation is observed or depending on the time of day, which does not accurately reflect the legal standard applied during such operations.