Final answer:
Police officers identify criminals by relying on descriptive information provided by witnesses, such as height and appearance, although there can be uncertainty in these descriptions.
Step-by-step explanation:
When it comes to identifying criminals in cases like robbery, police officers often rely on descriptive information provided by witnesses. This can include details such as the height, build, and appearance of the suspects. However, it is important to note that there is usually a degree of uncertainty in these descriptions.
For example, witnesses may describe a suspect as being of 'medium height,' or provide a range of heights like 'between 5 foot 8 inches and 5 foot 10 inches.' These descriptions can help narrow down the search for the criminals, but they are not always completely accurate.