About 110 immigration officers are suspected of involvement in the illegal issuing of visas for Chinese investors in so-called grey businesses, Immigration Bureau commissioner Pol Lt Gen Pakphumpipat Sajjaphan said on Monday.
He said they would be charged with malfeasance and demanding and taking benefits in return for illegal services.
Pol Lt Gen Pakphumpipat said he expected the investigation report would be completed and forwarded to the national police chief, Pol Gen Damrongsak Kittiprapas, this week.
In addition to criminal charges, they would also face investigation for serious disciplinary offences.
The immigration chief admitted the number of officers accused of involvement in corrupt practices was historically high. He said wrongdoers would not be protected.
As head of immigration and immediate supervisor of the accused, Pol Lt Gen Pakphumpipat said, he would look for weak points in the system ahead of a review to prevent a recurrence of the offences.