I saw a weed shop in Hua Hin soi51 next to a Dr's clinic , the shop was named Overdose, and was advertising premium and lower grades of dope, notice said cant smoke in the shop and no selling to under 20.
I don't think there was THC control on what he was selling by the contents of his dope menu.
So it may be quite easy to get very strong thc dope that can do strange things to people.
Stealing a Taxi was an idiot act, dope wouldn't cause someone to steal a taxi but it still can screw a person up if it's really strong.
What some tourists do here is very crazy they can be crazy and smoke gungha and drink and drive.
Probably why the roads seem much madder now, with locals smoking and driving.