RAW never makes an specifications on searching a room more than once. This is something left completely up to the DM's discretion for how to do it. Each dm has their own rules on how many times and how rooms and items can be checked, so always ask your dm.

RAW never makes an specifications on searching a room more than once. This is something left completely up to the DM's discretion for how to do it. Each DM has their own rules on how many times and how rooms and items can be checked, so always ask your DM.