It allows law enforcement to have access to ICE databases to check the immigration status of people they arrest.
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The police worked for Willard the MASS Gov...
anything they have he could use...
You don't seem to understand how the 287 g program functions. There are constitutional limits to what the police can do under the program, which again, is not used to verify legal status for employment purposes. I can't make it any clearer than that.
Fact Sheet: Updated Facts on ICE's 287(g) Program