Reasonable and probable grounds in Australia

In Australian criminal law, reasonable and probable grounds most prominently regulates police officers as a precondition of the exercise of certain powers in their function as enforcers of the law. Based on Australian common law, it is a prerequisite of most police powers (including arresting without a warrant, searching without a warrant, requesting disclosure of identity, and investigating terrorist activity).

Source: Wikipedia — Reasonable and probable grounds in Australia (CC BY-SA 4.0)