But the tourist, Falko Tillwich, was insistent. "I said absolutely not ... No way," he recalled, and later handed over his driver's license instead.
Tillwich's concern: losing vital travel documents, or worse having them stolen by criminal syndicates that are exploiting lax law enforcement and corrupt police here to support a global network of human smugglers, fugitives and sometimes, terrorists.
Investigators say it was unlikely the two men had links to terrorism and appeared to be illegal migrants trying to get to Europe. However, Malaysian Prime Minister Najib Razak said Saturday authorities were re-examining the list of crew and passengers after deciding the plane had deliberately changed course after taking off from Kuala Lumpur on the way to Beijing.
Passport theft is "a very big and critical problem in Thailand," said police Maj Gen Apichart Suribunya, who serves as Thailand's Interpol director. "It is a problem that Interpol, the United Nations and the international community have been trying to solve for years."
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Thailand's sapphire blue waters, wildlife parks, delicious cuisine and raunchy red light districts have attracted tourists for decades.
Last year alone, 22 million foreign visitors made the trip. That means "there are more passports to steal in Thailand than other countries in the region," said Clive Williams, a counterterrorism expert at Australia's Macquarie University.
Phuket is one of Thailand's tourism honeypots. Tourists flock here in droves each year for its sun, sand and laid back ambience. And some, like Italian Luigi Maraldi, lose their passports along the way.
In Thailand, passport forgers now use advanced technology, and their clients can evade capture by selling them to lookalikes who resemble the owners.
Most were run by nationals from Pakistan, India, Iran or Central Asia he said, for clients that are mostly illegal migrants.
The fact that travel documents are often stolen or forged in one country and used in another, though, "makes it hard for the governments to follow and arrest them," he said.