A checkpoint is legal if it is for a valid, specified purpose such as checking compliance with motor vehicle laws, checking for possession of a valid license and registration, or checking the driver’s sobriety.
As long as they check ALL vehicles (not targeting) for licenses as an example… They can carry out additional actions as they find them. So in your little town they can setup a checkpoint, check that everyone has a valid drivers license… And if they find an “illegal” or believe that you may be transporting “illegals” that can evolve into a terry stop, especially in stop and identify states.
Now, I think there are a few states that are more strict on the matter… but certainly not illegal in “all” of the US.
No they’re not.
https://rdslaw.com/are-police-checkpoints-legal-what-about-my-miranda-rights/
As long as they check ALL vehicles (not targeting) for licenses as an example… They can carry out additional actions as they find them. So in your little town they can setup a checkpoint, check that everyone has a valid drivers license… And if they find an “illegal” or believe that you may be transporting “illegals” that can evolve into a terry stop, especially in stop and identify states.
Now, I think there are a few states that are more strict on the matter… but certainly not illegal in “all” of the US.
Additional sources:
https://legal-info.lawyers.com/criminal/traffic-violations/law-enforcement-checkpoints-and-roadblocks-are-they-legal.html