Some #states — including #California, #Maine, #Massachusetts & #NewJersey — have enacted laws along the lines that Prof Amar proposed, though they are largely untested, & #Illinois recently adopted one tailored to address the conduct of #ICE agents.
https://ilga.gov/documents/legislation/104/HB/PDF/10400HB1312enr.pdf
The IL #law says that lawsuits may be filed “against any person who, while conducting #civil #immigration enforcement, knowingly engages in conduct that violates the Illinois Constitution or the #UnitedStates #Constitution.”