In what circumstances is a security guard generally authorized to conduct a search of a person they have lawfully arrested?

1. To find any personal belongings that might have been stolen.
2. To search for anything that might be considered evidence of any crime, past or present.
3. To conduct a full strip search to ensure no contraband is hidden.
4. Only for weapons or evidence related to the immediate arrest, and strictly as an incident to a lawful arrest.