Wow..
Law enforcement is a joke
How can you cross into Malaysia with a vehicle that isn't yours?
Did it have the 'sticker' that Romanizes the Thai number plate?
You need to be the owner to do that and it has to be done at the Dept of Transport
Good luck trying to do it on a rental.
Also..how come the Malaysians didn't stop -or even arrest- them?
All foreign cars are stopped a few kms into Malaysia and given a bit of a check.
..but wait....they snuck back into Thailand again, unmolested, made it to Pattaya and decided to overstay....????????
Meth is a hell of a drug.