What does a police checkpoint near the lake by the old airport typically check for in Thailand?

A user reports encountering a police checkpoint near the lake by the old airport, prompting curiosity about the nature of the checks being conducted. While others mention similar checkpoints focused on traffic regulations such as exhaust emissions and seatbelt compliance, there is speculation that this specific checkpoint may have had other motives, potentially including the search for illegal immigrants or enforcement against public health issues like Omicron. Comments from community members reflect a mix of experiences with different types of police stops in Thailand.