Final answer:
Private investigators are not categorized as law enforcement officers and are not directly subject to the Fourth Amendment, although they must adhere to legal practices.
Step-by-step explanation:
Private investigators are not considered law enforcement officers and therefore are not directly bound by the Fourth Amendment, which constrains the actions of government officials and police. The Fourth Amendment protects individuals against unreasonable searches and seizures and requires law enforcement agencies to have a warrant or probable cause to conduct such activities. However, private investigators must still operate within the boundaries of the law, and evidence obtained illegally by them could be inadmissible in court.