I guess it could be used for that but There are better ways of achieving this that doesn’t require the person having to scream. There has been research into using specialized radars to see through walls and detect vital signs. Now the engineering difficulty of mounting a system like this to a drone would be high but not impossible.
Human Vital Signs Detection Methods and Potential Using Radars: A Review - PubMed
Seeing through walls
Skynet moving from A Quiet Place to Predator