Law enforcement officers have a search warrant to search a house for heroin and to search the person of the house owners' 18-year-old daughter.
When the officers arrive at the house to execute the warrant, the following persons are present:
the owners;
their eighteen-year-old daughter;
their fifteen-year-old son, who appears extremely nervous;
the daughter's boyfriend, whom the officers recognize as a local gang member who is known to carry a knife; and an unidentified elderly couple.
To what extent may the officers search or detain each person present?