I can see local and state law enforcement working with the FBI bc they are the country’s federal version of police. iCE is specifically enforcement of immigration laws. Local and state should focus on local and state and let ICE focus on immigration. A lot of police departments don’t like retaining people for ICE bc they don’t get refunded for the costs of doing ICEs job. Plus, communities that have high levels of immigrants, legal and otherwise, won’t assist police in regards to local crime if they think doing so would endanger themselves or family members of being deported. Which is precisely why multiple police departments stopped complying with detainer requests BEFORE sanctuary cut laws were established. In a nutshell, if you want crimes, particularly violent crimes, to be solved in all communities let police/law enforcement focus on their own jurisdictions.