National police chief Pol Gen Torsak Sukvimol has revised police regulations to allow male officers to grow their hair up to 5 centimetres long.
A male police officer is allowed to grow his hair on top of his head no more than 5cm, while both the sides and back of his head should be less than 1cm.
Previously, a male officer had to have a very short hair style with both sides and the back of head completely shaved, a source said.
In addition, police officers, assigned to investigation, intelligence, narcotics or who are in at-risk areas, are allowed to have a high-fade haircut, but permission must be granted by their superiors.
Regarding women officers with long hair, the source said they must tie their hair properly with a black hairpin.
Male officers will now not have to get a haircut once a week, saving those who go to private barbers money, the source said. It is not known if the change is in response to calls from the police themselves.