Which of the following is a common indicator of suspicious behavior?

Unusual movements are indeed a common indicator of suspicious behavior. This includes behaviors that deviate from the norm, such as someone frequently looking over their shoulder, moving in a way that seems secretive or evasive, or attempting to avoid detection. These types of movements could suggest that the individual is aware of their surroundings and is attempting to conceal their actions, which raises concern about their intentions.

Indicators like excessive laughter, frequent visits from friends, and normal traffic patterns do not typically convey suspicion. Excessive laughter may signal comfort or enjoyment rather than suggest anything nefarious. Frequent visits from friends could be entirely innocent social interactions, and normal traffic patterns generally indicate the expected flow of people and vehicles without any unusual activities or behaviors. Thus, focusing on unusual movements provides a clearer assessment of potentially suspicious behavior.