People could sue red shirts if they violate their rights, National Human Rights Commission chairwoman Amara Pongsapich said Monday.
They could also lodge a complaint against local police for failing to carry out their duty to protect people.
In the previous weeks, the red shirts set up checkpoints to block and search vehicles in many provinces. In many cases, they assaulted people who refused the search.
“Police cannot allow any unauthorised person to conduct a search or intimidate others,” said Amara.