I'd say that a fair amount of circumspect should be exercised in this.
Reporting to the Thai police would be a pretty dangerous thing - what if you were wrong? Perhaps Interpol, or the person's own home Embassy would be a better way to drop an anonymous hint.
Grasses often end up is a spot of bother somewhere down the line - especially if you are wrong!!! Could cost you more than a pretty penny in legal costs & damages.





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