Criminal Law

Intervening cause is an independent force that occurs after the defendant's act and is also an actual cause of the harm.

Whether or not an intervening cause breaks proximate causation is usually determined using a foreseeability test.

Factors used in determining if an intervening cause breaks the defendant's proximate causation are:

• How substantial the defendant's causal responsibility is to that of the intervening cause
  • If insubstantial, unlikely to be foreseeable.
  • The defendant cannot escape liability if the intervening act was "reasonably foreseeable."

  An intervening cause can either be responsive to or independent of the defendant's actions.

  A responsive cause is one that occurs in reaction or response to the defendant's prior wrongful conduct.

  A responsive intervening cause generally does not relive the initial wrongdoer of criminal responsibility because it is generally foreseeable.

  An independent cause is a force that does not occur in response to the initial wrongdoer's actions but does occur because of the situation such action placed the victim in.

  An independent cause will usually relieve the original wrongdoer of criminal responsibility of the independent cause's harm unless it was foreseeable.

  If the other factors do not make it clear, it is unlikely to be proximate cause, but a few miscellaneous factors can still be considered:

  • Whether the intervening cause completes the specific consequences intended by the defendant
  • Whether the defendant's "active force" has come to rest, causing apparent safety, before the intervening cause occurs
  • Whether the intervening cause comprised direct and deliberate human intervention

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