Which of the following is NOT a typical mistake made in surveillance?

In the context of surveillance operations, changing vehicles used for surveillance every day can actually be a strategic choice rather than a mistake. This practice can help investigators avoid being detected, as consistently using the same vehicle might draw attention and make it easier for the target to identify or lose the tail. By varying the vehicle, investigators can enhance their ability to monitor subjects without compromising the objectives of the surveillance operation.

On the other hand, failing to document evidence, not planning surveillance strategies, and losing track of logged observations are all typical mistakes that can significantly undermine an investigation. Documentation is crucial for maintaining a clear record of activities and observations that may be needed for legal procedures. Planning is vital for anticipating potential challenges and ensuring that the surveillance is conducted effectively. Losing track of logged observations can lead to gaps in information, which could result in missed opportunities or inaccurate reporting of findings. Therefore, while changing vehicles might be a sound strategy, the other options reflect common pitfalls in the surveillance process that can hinder an investigation.