Which of the following circumstances would probably not qualify for a simple frisk?

A simple frisk, also known as a pat-down, is a limited search for weapons that law enforcement or security personnel are permitted to conduct when they have reasonable suspicion that a person may be armed and dangerous. The key elements for a lawful frisk include specific and articulable reasons, rather than just a vague hunch or a general appearance.

In the circumstance described, when a person looks like someone who might commit a crime, this is typically based on subjective judgment or profiling rather than individualized suspicion. Such a basis lacks the necessary specific and articulable facts to justify a frisk. Reasonable suspicion must be grounded in observable behaviors or circumstances, not merely on assumptions about a person's appearance.

The other options reflect situations in which reasonable suspicion can be established through factual indicators: if a person has committed a crime, is about to commit one, or if there is a credible concern about personal safety due to a perceived threat. Each of these scenarios indicates specific behaviors or circumstances that warrant taking precautionary measures, such as a frisk.