If the police arrive at Larry's office without probable cause or a warrant and demand to search the premises, which amendment protects him from this type of search?

The Fourth Amendment

Explanation: The Fourth Amendment of the United States of America constitution guarantees the rights of the Citizens of the United States of America against unlawful seizures and searches. This is to ensure that No unauthorized access, or any form of unapproved intrusion into the privacy of a Citizen shall be given to any law enforcement agencies or officers except if it is guided by an Oath or other Legal warrants.

"quid pro quo" harassment takes place when a supervisor requires sex, sexual favors, or sexual contact from an employee/job candidate as a condition of their employment. only supervisors who have the authority to make tangible employment actions (i.e. hire, fire, promote, can commit "quid pro quo" harassment.