Could also be the result of someone with serious mental illness smoking MJ. People with schizophrenia, bi-polar disorder, etc. can respond very differently if they smoke pot, even just a small amount. It can cause auditory and visual hallucinations, paranoia, mania, all kinds of bad things. I've seen it first hand and am sure most people in LE have seen it too. It can happen fairly quickly, too, within 10 or 15 minutes of smoking. The effects seem to last a very long time, even several hours or a day or more. I've only seen it happen twice, but it totally messes up some people's wiring.