Which of the following is a component of a checking station's operation?

The placement of checkpoints should be random or statistically indicated to ensure that they are effective and unbiased. This approach minimizes the potential for discrimination and helps in the fair enforcement of laws. Statistically based placement may involve using crime data and other relevant statistics to determine locations that are more prone to offenses, thereby increasing the likelihood of identifying violations effectively.

In contrast, the other options present practices that could undermine the integrity and effectiveness of checkpoint operations. Announcing checkpoints through social media could lead to drivers avoiding them, which would defeat their purpose. Operating checkpoints without written policy can lead to inconsistent practices and potential legal issues, as established procedures are vital for accountability and transparency. Lastly, relying solely on verbal advice to motorists does not meet the standards for proper notification and operational transparency expected in checkpoint procedures.