The former immigration police chief on Wednesday linked the gunshots fired into his car on Monday to his opposition to a 2 billion baht contract for equipment to screen passengers at major airports.
Surachet Hakparn handed over documents relating to the biometric project to interrogators while being questioned at Bang Rak police station.
The former police officer, better known as Big Joke, told reporters that he viewed his attempt to block the project as the only possible motive for the attack on his SUV on Monday night.
Pol Lt Gen Surachat had earlier urged the national police chief, in a written statement, to consider cancelling the project when he was still the immigration police commissioner last year.
The 2 billion baht project involved the purchase of biometric equipment to scan the faces and fingerprints of visitors and residents going through major airports. He cited the long delay and questioned the equipment's efficiency as among the reasons to end the contract.
After Big Joke was forced out of the police circle into a civilian position as adviser to the Prime Minister's Office last year, his successor, Pol Lt Gen Sompong Chingduang, placed stress on being fair to the contractor.
The new immigration police chief has even praised the biometric system on more than one occasion, pointing out how it had identified suspects passing through airports, and they were then arrested.
