Why are immigration officers checking foreign residents' passports in Ubon Ratchathani?

In Ubon Ratchathani, immigration officers are conducting checks on foreign residents' passports as part of their routine job. A resident on a SETV with extension experienced a visit from the officers, noting that it can be intimidating but manageable with respect and cooperation. The community discussed the frequency of these checks, highlighting that such visits can happen to any visa holder, especially noted for certain visa types like the marriage visa, as indicated on government websites.