gunman under the influence of drugs,
Residents have been urged to exercise heightened vigilance and take necessary precautions for their safety.
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Likely Methamphetamine?
It often promotes aggressive behavior, combined with paranoia.
Is it OK for armed civilian vigilante to take care of this kind of SO* in Thai laws?
In this kingdom, even unarmed people often exercise strong sense of justice in emergency forming an instant coalition with the people nearby(e.g.grabbing at thieves on the spot).