Under what condition may PIR not be gathered using intrusive means?

Gathering Priority Intelligence Requirements (PIR) through intrusive means typically necessitates adherence to legal protocols to ensure that the rights of individuals are respected. When considering the option related to search warrants, it is important to recognize that a search warrant serves as a legal permission granted by a judge that allows law enforcement to conduct searches of property or individuals when there is probable cause.

If PIR gathering involves intrusions that qualify as searches under the law, performing these actions without a search warrant would violate legal standards and the Fourth Amendment, which protects against unreasonable searches and seizures. Therefore, the absence of a search warrant means that the operation would not be lawful, making it impossible to carry out PIR gathering through intrusive means. Thus, the requirement for a search warrant is crucial to ensure that the methods utilized comply with legal expectations and protect the rights of individuals involved.

In contrast, the other conditions, such as having permission from the property owner or ensuring the presence of law enforcement, may facilitate the gathering of intelligence but are not as universally essential as having a search warrant in the context of intrusive means. Notifying the subject varies based on specific operational guidelines and legality depending on the situation and may not be a requirement for all types of PIR gathering. Therefore, focusing on the necessity