While uncool, most of this is probably legal if they're
   doing what they say and "cross check"ing crime / license
   db's and other records against State's immigration db's,
   thereby establishing what amounts to warrant-ready cause
   as to any current lack of status.
   Unlike the stuff below which demonstrates plainly
   unconstitutional mass / random checkpointing,
   unreasonable suspicion, lack of cause, willful
   infringement, slope icing, harassment, lies, etc...
   [1]https://www.youtube.com/results?search_query=copblock
   [2]https://www.youtube.com/results?search_query=dui+checkpoint
   [3]https://www.youtube.com/results?search_query=open+carry
   [4]https://www.youtube.com/results?search_query=filming+police
   [5]https://www.youtube.com/results?search_query=border+stop
   Either way, all this stuff is going to hit the courts
   and legislature big now, so yeah, lots of change possible
   during such times if you want to make it happen [1].
   Bet the sanctuary states, counties, cities, employers are
   feeling stupid for all those db sharing agreements they
   signed with the feds who are now duly mining it all
   like Nazi's through their cardfiles... oops.
   They shoulda listened to the privacy adovocates.
   [1] If nothing changes, democrats will ban guns
   in 2025 and use their cardfiles the exact same way.
   And <power> will ... in .... and use ... .

References

   1. https://www.youtube.com/results?search_query=copblock
   2. https://www.youtube.com/results?search_query=dui+checkpoint
   3. https://www.youtube.com/results?search_query=open+carry
   4. https://www.youtube.com/results?search_query=filming+police
   5. https://www.youtube.com/results?search_query=border+stop