Google Excited Delirium (ED) instead of zombie you will see the effects of drugs like bath salts...

[link to www.exciteddelirium.org]
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The aggressiveness, hyperactivity, incoherent shouting, and extreme paranoia exhibited by the suspect in the video are always associated with ED. This suspicion is confirmed by the fact that the suspect was found to be hyperthermic as indicated by not wearing a shirt. Individuals often disrobe or are found naked. This person had an eventual cardiorespiratory collapse in the absence of lethal force. With a completed brain autospy showing the biological signature of ED, it can be concluded that excited delirium played a role in this man's death. In order for police officers to avoid situations like the one shown, it is essential to understand and recognize excited delirium when it presents itself.