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What is necessary for a private investigator to act on when using force?

  1. The instruction of their client

  2. Confirmation from a police officer

  3. Reasonable grounds

  4. Owners' permission when on private property

The correct answer is: Reasonable grounds

A private investigator must always have reasonable grounds to use force in any situation. This means that they must have a reasonable belief that an individual poses a threat or that their own safety is at risk. The instruction of a client or confirmation from a police officer may not always be based on reasonable grounds, and owners' permission is only necessary when the investigator is on private property. Therefore, the most important factor in determining the use of force for a private investigator is the presence of reasonable grounds.