# Negative probability and spin-0 scalar field in Klein-Gordon equation

Klein-Gordon equation in quantum field theory is known to suffer from the possibility of negative probability. So, the question is, despite this, Klein-Gordon describes spin-zero field. So, how can negative probability and scalar field co-exist?

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More on Klein-Gordon equation and negative probabilities in quantum mechanics: physics.stackexchange.com/q/39224/2451 –  Qmechanic Oct 14 '12 at 18:20