Create a list of warning signs that would make someone appear suspicious?

Warning signs that may indicate someone is suspicious include unusual behavior, such as avoiding eye contact or fidgeting excessively. They might also exhibit nervousness, like sweating or stammering, and their responses could seem inconsistent or evasive. Additionally, if a person is overly protective of their personal belongings or frequently changes their story, these could be red flags. Lastly, a lack of a clear purpose for their presence in a particular area can also raise suspicion.