BANGKOK (THOMSON REUTERS FOUNDATION) - Thai prosecutors turned down about a fifth of human-trafficking cases sent to them by police last year, a soon-to-be-released government report shows, raising concerns that police were on a drive to boost numbers to enhance Thailand's global image.

The 79-page report - drafted to inform an annual US report ranking countries on their efforts to combat trafficking and revealed exclusively by the Thomson Reuters Foundation - showed that Thailand's public prosecutors rejected 64 of 364 cases in 2019.

Thailand has faced criticism in recent years for failing to stop trafficking in its lucrative textile and seafood sectors, as well as the sex trade. The country secured 194 trafficking convictions last year, down 17 per cent from 2018, the report found.

Most of the cases dismissed last year involved smuggled migrants being misidentified as trafficking victims, according to two prosecutors who said police had been told to increase trafficking figures amid concerns about the dwindling number.

"In practice, (most) of the police know that the cases involve smuggling, but they receive orders to treat them as human trafficking offences," one public prosecutor said on condition of anonymity because of the sensitivity of the matter.

"This is perhaps due to the lack of clear understanding on the differences between trafficking and smuggling of migrants."

The percentage of trafficking cases dismissed by prosecutors hit a record 18 per cent last year, up from 10 per cent in 2018 and 4 per cent in 2017.

The 64 rejected cases from 2019 were instead prosecuted under smuggling and transnational crime laws, the report said.

Police Lieutenant-General Jaruvat Vaisaya - the country's top anti-trafficking cop - said officers were responding to a growing number of people being transported towards Malaysia.

Unlike trafficking, which involves deception or control over another person for the purpose of exploitation, smuggling means entering another country illegally and is considered consensual.

Lawyers and campaigners said the conflation of smuggling and trafficking meant that some state resources intended for trafficking victims were being spent on migrants who had not been exploited.

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A second prosecutor source said they had also heard of police officers being ordered to find more trafficking victims.

"This clearly shows that (the government) wants the highest number of cases to show that many arrests have been made," said Mr Adisorn Kerdmongkol, a coordinator at the Migrant Working Group. "Human trafficking is a political issue in Thailand."

Thailand's anti-trafficking department - part of the social ministry - declined to respond to questions about the report, which is due to be sent to US officials by the end of January.

WASTED RESOURCES?

Thailand rescued a record 1,807 trafficking victims last year, up from 622 in 2018, the government said this month. Most were Myanmar migrants bound for Malaysia and campaigners have questioned whether many had in fact been smuggled.

Police chief Jaruvat said it was certain that people headed to Malaysia would be trafficked once they crossed the border.

"Regardless of whether it's human trafficking or not, what we want is for the offenders to be in jail," he said, adding that prosecutors had dismissed trafficking cases referred to them by police because "the crime has not been committed yet".

Public prosecutor Pravit Roykaew said Thai authorities often rushed to make decisions within 24 hours about whether or not someone was a victim of human trafficking.

"Authorities are confused with the (trafficking) law ... it does not provide a specific timeframe on identifying victims," Mr Pravit said. "This results in not getting all the facts, which may cause ... misidentification."

From court proceedings to the provision of care in state-run shelters, wrongly labelling smuggled migrants as trafficking victims has wasted government time and money, said Mr Papop Siamhan, an independent lawyer with expertise in trafficking.

"If it's one or two cases, it's acceptable, but if you have over 60 cases (that were dismissed), it means you just weren't careful enough," he said. "Having a high number of cases doesn't mean that Thailand is successful in solving human trafficking."

Thailand is home to about 610,000 modern-day slaves - about one in 113 of its population of 69 million - according to the Global Slavery Index by the rights group Walk Free Foundation.